10 Best Magnetic Contacts for Doors (November 2026) Expert Guide

Magnetic contacts for doors provide a simple, dependable way to detect when a door or window opens. The best model should suit the opening, match the alarm system’s wiring logic, and remain reliably aligned after installation. Factors such as mounting style, sensing distance, housing material, and included hardware all affect performance.

The products in this guide were compared using the supplied specifications, including contact type, mounting configuration, operating distance, wire compatibility, package quantity, and intended applications. The list covers recessed, flush-mounted, and surface-mounted designs for residential, commercial, garage, and access-control installations.

Each review explains the standout features, practical trade-offs, and likely installation scenarios for its product. Ratings reflect the supplied marketplace feedback rather than hands-on testing, and product specifications, availability, and pricing can change, so readers should confirm current details before purchasing.

Top 3 Picks for Best Magnetic Contacts for Doors

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Top 10 Best Magnetic Contacts for Doors in 2026 Compared

The comparison highlights each contact’s mounting method, electrical configuration, operating range, and best-fit application, making it easier to match a sensor to a door type and alarm panel.

1. 4 Sets NC Wired Contact – Easy Surface Installation

4.4Editor scoreCheck price on Amazon

4 Sets NC Wired Contact

Four complete contact sets

Normally closed configuration

Over 1/2-inch operation

22–28 AWG compatible

This package includes four NC wired door alarm contact sensors with double-sided tape for installation. Its 4.4 rating reflects generally favorable customer feedback, while its appeal comes from a simple surface-mounted format that can be adapted to many ordinary doors and windows. The white housing gives it a relatively discreet appearance.

Pros

• Quick adhesive installation
• Broad wire compatibility
• Useful operating distance
• Four-set package
• Suitable for windows

Cons

• Adhesive may suit less
• No screw mounting specified

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The most useful feature is the included double-sided adhesive, which can reduce installation time when a quick, clean bond is possible. Its operating distance exceeds half an inch, offering useful tolerance when the door closes. The contacts are suitable for 22–28 AWG wiring, giving installers flexibility when connecting them to compatible alarm or access-control circuits.

The primary trade-off is that adhesive mounting may be less suitable for high-moisture, dusty, frequently serviced, or unevenly finished surfaces. The product information does not mention screw hardware, so installers needing mechanical fastening may need to provide their own attachment method. Buyers should also confirm that their panel expects normally closed logic.

This is a practical choice for homeowners, renters, offices, and shops that need several inexpensive, surface-mounted contacts and want the fastest installation path. It is particularly attractive when the opening already has a smooth, clean surface. For those who need stronger mechanical attachment or plan to use the contact in a garage or outdoor location, a screw-mounted model may be more appropriate.

Fast Adhesive-Based Setup

The double-sided tape can make installation quick on clean, smooth surfaces, reducing the need for drilling and extensive layout work. Clean the bonding area first and confirm the final position before pressing the contact into place.

Useful Alignment Tolerance

An operating distance of more than half an inch provides some margin if the magnet and switch are not perfectly centered. Maintain consistent alignment each time the door closes for dependable signaling.

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2. Magnetic Door Switch RC-33 – Versatile Five-Set Contact

4.7Editor scoreCheck price on Amazon

Magnetic Door Switch RC-33

Five complete contact sets

15–25 mm actuation

Recessed installation style

ABS housing and 24 AWG

The RC-33 is a five-set package of recessed, normally closed magnetic door switches. With a 4.7 rating, it has the highest supplied customer rating in this comparison. Its 15–25 millimeter actuation range, ABS housing, and 24 AWG leads make it a detailed, versatile option for conventional alarm installations.

Pros

• Highest supplied rating
• Five contact sets
• Clear electrical ratings
• Compact recessed format
• Compatible 24 AWG wiring

Cons

• Requires recessing the switch
• Working voltage is limited

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Its technical specifications are particularly helpful when designing a system. The listed maximum current is 0.5 amp, maximum contact power is 10 watts, and maximum working voltage is 110 volts. These values should still be checked against the connected panel and other devices. The product also clearly explains its NC behavior: the circuit conducts when the magnet is joined and becomes nonconductive when separated.

Recessed mounting makes this model more attractive where appearance matters, but installation requires cutting or routing a cavity for the switch. The operating range is narrower than some of the larger surface-mounted garage contacts, so alignment must be handled carefully. It is also a wired product and does not include an entire alarm system.

Buyers seeking a balanced general-purpose contact for several doors or windows should give the RC-33 strong consideration. It suits installers who understand recessing and appreciate clearly stated electrical limits. The five-set format also makes it efficient for securing multiple openings rather than buying individual components one at a time.

Detailed Electrical Compatibility

The stated current, power, and voltage limits help installers compare the RC-33 with their alarm panel and circuit design. Compatibility still depends on the complete system, so verify requirements before installation.

Five-Set Installation Efficiency

Five complete sets support multi-opening projects and reduce the need for separate purchases. The package includes the magnetic door switches needed for those monitored positions.

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3. 5 Pack Cylindrical Contact – Compact Low-Profile Detection

4.4Editor scoreCheck price on Amazon

5 Pack Cylindrical Contact

Five compact contact sets

Flush cylindrical mounting

3/8-inch drill diameter

24 AWG standard leads

This five-pack uses small, cylindrical, flush-mounted magnetic contacts intended for windows and wooden doors. Its 4.4 rating indicates positive user feedback, and the low-profile design is the defining feature. The switch fits a 3/8-inch hole, helping it sit neatly within a drilled recess rather than projecting conspicuously from the frame.

Pros

• Compact and concealable
• Simple 3/8-inch bore
• Five-set package
• Suitable for wood doors
• Standard lead length

Cons

• Limited lead length
• Not suited for garage gaps

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The small form is useful when appearance or clearance is important. The product description highlights easy installation and concealment, while the 300-millimeter, 24 AWG leads give installers enough wire to route a short connection into a nearby frame or access-control device. Five sets are included for multi-door or multi-window projects.

Its compact scale also brings limitations. The relatively short leads may be insufficient for longer cable runs, and a flush contact demands accurate drilling and alignment. It is better suited to ordinary wooden doors and windows than to roller shutters, garage doors, or other openings with substantial movement or separation.

This is a sensible choice for homeowners and installers securing several straightforward openings on a budget. It is especially attractive where a nearly invisible installed profile matters more than a long sensing gap. Buyers should verify the panel’s NC input requirements, drill the specified diameter carefully, and test each door’s closing alignment.

Discreet Flush-Mounted Profile

The cylindrical switch can be recessed into a drilled opening, leaving less of the sensor exposed than a conventional surface contact. Use the stated 3/8-inch diameter to avoid an oversized or unstable hole.

Ideal for Multiple Openings

Five sets make the product convenient for apartments, small offices, and homes with several wood doors or windows. The included standard leads simplify connection to nearby compatible devices.

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4. QWORK MC-31 Contact – Neat Surface Mounting

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QWORK MC-31 Contact

Five surface contact sets

20 mounting screws included

8 mm ±18 mm range

White plastic housing

The QWORK MC-31 is a pack of five white, surface-mounted NC reed switches with 20 screws. Its 4.1 rating is the lowest among the five-set options, yet the package remains practical for installers who value a complete mechanical mounting kit. It is listed for doors, windows, cabinets, and other security applications.

Pros

• Screws and contacts included
• Two housing size options
• Broad application range
• Clean white appearance
• No adhesive dependency

Cons

• Lower supplied rating
• Wide range needs testing

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The supplied dimensions are listed as 64 by 12 by 12 millimeters and 64 by 20 by 12 millimeters, suggesting two housing configurations within the set. Its 5.8-millimeter hole diameter and 8 millimeter ±18 millimeter actuation distance provide useful information for frame planning. Screw mounting is preferable to relying only on adhesive in busy or exposed locations.

The unusually broad stated actuation range can be helpful, but it may make the final operating point less obvious than a tightly specified product. Installers should test the magnet position and avoid relying on the maximum end of the range for routine detection. The rating should also be considered alongside the strong hardware package and clear application scope.

Choose the MC-31 when mechanical attachment, multiple contact sizes, and included screws matter. It is a good fit for technicians or property managers who want a conventional surface contact they can install on varied openings. Confirm the required wire gauge, panel configuration, and available space before ordering.

Complete Screw-Mounting Kit

Twenty included screws support the five packaged contacts, making the set more convenient than purchasing fasteners separately. The surface housings can also be repositioned if a frame requires a different layout.

Useful for Several Opening Types

The same contact family can monitor windows, doors, cabinets, and other moving surfaces. A consistent NC reed-switch design simplifies purchasing decisions across multiple applications.

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5. Garage Door Contact – Rugged Monitoring for Large Doors

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Garage Door Contact

Zinc alloy contact housing

Up to 1.97-inch range

15-inch armored cable

Adjustable L bracket

This wired NC contact is purpose-built for garage doors, overhead doors, roll-up shutters, and gates. It carries a 4.4 rating and stands out for its zinc alloy housings, adjustable L bracket, 15-inch armored cable, and stated sensing distance of up to 1.97 inches.

Pros

• Durable metal housings
• Long armored cable section
• Adjustable mounting bracket
• Wide sensing distance
• Broad low-voltage compatibility

Cons

• Only one contact set
• Mains connection prohibited

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The physical design addresses the rough environment around garage and utility openings. A metal switch housing and magnet resist everyday wear more convincingly than a lightweight plastic-only contact. The adjustable bracket allows the installer to position the components after considering the door’s travel, surface angle, and nearby framing.

This is not a complete alarm kit. A compatible low-voltage alarm panel, access-control input, automation controller, power supply, extension wire, connectors, and tools may all need to be sourced separately. The maximum ratings of 100 volts DC, 0.5 amp, and 10 watts limit its use, and it must not be connected directly to 110- or 220-volt AC mains.

It is best for a homeowner, installer, or small business securing one garage or utility opening where durability and a broad sensing gap matter. Measure before buying, as the switch and magnet have different dimensions, and allow enough cable for the planned wire route. Confirm panel compatibility before installation.

Built for Garage Environments

Zinc alloy housings and an adjustable metal bracket suit demanding openings better than lightweight plastic alternatives. The product is intended for garage, overhead, roller-shutter, and gate applications.

Armored Cable Routing

The 15-inch armored cable section provides useful reach between the contact and a nearby protected wiring route. It still may require extension wire, which is not included in the package.

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6. 5 Pack Screw Terminal Contact – Clean Terminal-Style Installation

3.9Editor scoreCheck price on Amazon

5 Pack Screw Terminal Contact

Five complete contact sets

Screw terminal connections

Surface-mounted housing

Covered mounting hardware

This five-pack includes NC magnetic switch contacts with screw terminals and a cover designed to conceal mounting and terminal screws. Its 3.9 rating is the lowest supplied among the products reviewed, so buyers should weigh that feedback carefully. The design is otherwise straightforward and aimed at wired burglar alarms and access-control systems.

Pros

• Accessible screw terminals
• Neat protective cover
• Mounting screws included
• Works with wired systems
• Broad opening suitability

Cons

• Lowest supplied rating
• Terminal style needs space

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Screw terminals are convenient for installers who prefer a direct, tool-based wire connection. The cover improves the finished appearance by hiding the fasteners, while the product’s stated ease of installation makes it practical for family homes, factories, windows, and doors. The included mounting hardware reduces preparation work.

The 3.9 rating may reflect concerns that cannot be determined from the supplied specifications, so it should not be ignored. Terminals also require enough clearance for wiring and tools, and the product information does not provide detailed operating-distance or electrical figures. Buyers needing precise technical values should request those before committing to a larger installation.

This set is most appropriate for a wired installer who values terminal access, a neat appearance, and compatibility with common alarm or access-control equipment. It can serve homes, offices, and small commercial properties. Confirm electrical ratings, wire type, and panel input configuration, and test the contact after installation.

Practical Terminal Connections

Screw terminals provide a familiar way to secure wiring without relying on a separate terminal block. Route the cable into the housing carefully so the cover can be replaced without pinching it.

Cleaner Finished Appearance

The attractive outer cover hides both mounting screws and terminal screws. That makes the installed contact less distracting on visible frames while retaining service access.

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7. 3/4-Inch Flush Contact – Discreet Detection for Metal Doors

4.6Editor scoreCheck price on Amazon

3/4-Inch Flush Contact

Five flush contact sets

3/4-inch mounting diameter

Over 1-inch operation

50,000-cycle reed switch

These black, 3/4-inch flush-mounted contacts come in a five-set package and carry a 4.6 rating. Their notable specifications include an operating distance of more than one inch and a reed switch and magnet rated for more than 50,000 open-and-close cycles. The product is positioned for doors and windows, including metal doors.

Pros

• High supplied rating
• Long stated operating range
• Suitable for metal doors
• Color helps frame matching
• Self-locking clip

Cons

• Black finish may stand out
• Requires accurate hole placement

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The larger 3/4-inch mounting diameter provides room for a self-locking clip and a more substantial recessed profile. Its stated operating range exceeds one inch, which can be helpful on metal doors because the magnet may not align as precisely as it would on some wood-frame installations. Black and white color options offer flexibility for different frame finishes.

Accurate drilling remains important. If the switch and magnet are positioned poorly, the contact may not operate consistently, and a flush installation offers little room to compensate afterward. The black finish may also be less suitable for a light-colored door than the white version. The stated cycle figure is a manufacturer specification, not a substitute for real-world endurance testing.

This model suits installers seeking a discreet contact with a generous operating range and strong supplied customer feedback. It is especially relevant for metal doors where precise magnetic alignment can be more difficult. Use the specified 3/4-inch diameter, confirm NC panel compatibility, and test the door across its full closing range.

Generous Sensing Range

More than one inch of stated operation provides useful placement tolerance. This can benefit metal doors, where the movable magnet may sit slightly farther from the recessed switch than on a wood frame.

Designed for Repeated Opening

The reed switch and magnet are stated to withstand more than 50,000 open-and-close cycles. Frequent use still calls for sensible alignment and periodic visual inspection of the mounting area.

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8. Heavy Duty Garage Contact – Rugged Bracket for Garage Doors

4.6Editor scoreCheck price on Amazon

Heavy Duty Garage Contact

Zinc alloy construction

Adjustable mounting bracket

At least 50 mm gap

Surface-mounted installation

The Heavy Duty Wired Alarm Garage Door Magnetic Contacts Switch is designed for roller-shutter and garage doors. Its 4.6 rating reflects strong supplied feedback, and its defining construction features include a metal zinc alloy housing, surface mounting, and an adjustable bracket. It is a focused alternative to smaller residential contacts.

Pros

• Durable zinc alloy housing
• Adjustable bracket included
• Generous operating gap
• Designed for garage doors
• Compatible with alarm systems

Cons

• Single-opening package
• Minimum gap must be maintained

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The adjustable bracket makes it easier to accommodate uneven garage-door surfaces and differing frame positions. The stated operating gap is at least 50 millimeters, offering meaningful separation between the magnet and switch while still allowing the door to operate. Its NC contact is designed to switch off when the magnet moves away, matching compatible alarm-system logic.

The substantial 50-millimeter minimum gap means the two components must be mounted at the correct separation; they cannot simply be placed close together. This model is not a multi-pack, and other system components may still be required. While the metal housing is robust, exposed outdoor placement also warrants consideration of the actual door environment and cable routing.

This is the premium pick for a garage, roller shutter, or similar demanding opening where an adjustable heavy-duty bracket is valuable. Choose it over a compact residential contact when durability, larger separation, and adjustable positioning outweigh package quantity. Confirm the required gap, panel compatibility, and wiring before installation.

Adjustable Heavy-Duty Positioning

The bracket allows fine adjustment after the door, frame, and magnet positions have been evaluated. This flexibility is valuable on garage surfaces where a fixed surface-mount layout may not align cleanly.

Large Operating Separation

The stated gap of at least 50 millimeters supports dependable operation across larger garage and roller-door applications. Install the components at a consistent distance and confirm the alarm response in practice.

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9. 20 Sets Surface Contact – Broad Coverage for Large Installations

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20 Sets Surface Contact

Twenty complete contact sets

Surface-mounted design

Double-sided adhesive included

80 separate screws

This 20-set package provides surface-mounted NC magnetic contacts for doors and windows, along with double-sided tape and 80 screws. Its 4.1 rating is positive but trails the strongest products in the guide. The large quantity and dual mounting options make it relevant to homes, offices, and public spaces that need many monitored openings.

Pros

• Large twenty-set package
• Tape and screws included
• Supports varied door materials
• Useful for public locations
• Multiple wiring applications

Cons

• Lower supplied rating
• Adhesive durability varies

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The ABS housing is described as high-strength and heat-resistant, while the adhesive backing offers a quick mounting alternative. The separate bag of 80 screws allows mechanical attachment where preferred. Installation options also make the contacts applicable to plastic, glass, and wood doors and windows, as well as public-area installations.

The primary consideration is that adhesive performance varies with surface texture, temperature, cleanliness, and exposure. Stronger screw mounting is preferable in high-stress or frequently disturbed locations. The 4.1 rating and lack of a detailed operating-distance specification in the supplied information mean buyers should confirm important technical requirements before deploying all 20 sets.

This product is a good fit for an installer covering numerous openings without wanting to make many individual purchases. It is particularly useful for office and hospitality projects with mixed door materials. Choose a clean bonding area or use the included screws, and confirm the panel’s normally closed input requirements before deployment.

High-Volume Project Coverage

Twenty complete sets provide the scale needed for offices, dormitories, shops, and other properties with many openings. A large package also helps maintain consistent contact specifications throughout an installation.

Flexible Surface Attachment

Double-sided tape enables fast placement, while 80 screws offer a more secure alternative. The installer can select the method that best matches each surface and the expected level of disturbance.

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10. Tellegloww 20 Set Contact – Convenient Multi-Sensor Installation

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Tellegloww 20 Set Contact

Twenty complete contact sets

Adhesive and screw mounting

Working current under 12V

Surface-mounted plastic housing

The Tellegloww package contains 20 surface-mounted NC door and window sensors, 80 screws, and adhesive mounting material. Its 4.3 rating reflects generally positive feedback, while the 20-set count and simple installation method make it useful for homes, offices, dormitories, shops, and hotels.

Pros

• Twenty contact sets
• Simple adhesive installation
• Screws included for alternatives
• Works with varied door materials
• Suitable for larger premises

Cons

• No electric wires included
• Under-12-volt limitation

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The stated working-current condition is under 12 volts, so the product is intended for appropriately compatible low-voltage systems. A plastic housing provides a lightweight, clean-looking solution, and the included screws allow mechanical installation even where adhesive alone is unsuitable. The sensors are stated to work with wood, glass, and plastic openings.

A critical detail is that electric wires are not included. Buyers must source suitable wiring, and the product should not be assumed to be a complete drop-in alarm package. The operating-distance figures and detailed contact ratings are also not stated in the supplied data, so installers should verify compatibility with the controller and cable type before a large rollout.

This product is a convenient choice for a property manager or installer covering many openings and seeking either adhesive or screw mounting. It is less suitable when a ready-to-connect cable is essential. Confirm the under-12-volt requirement, obtain the necessary wires, and test each position before the system is placed into service.

Large Package for Uniform Coverage

Twenty sensor sets and 80 screws support broad projects without mixing components. A consistent contact type can simplify wiring practices and maintenance across many openings.

Adhesive or Mechanical Mounting

Adhesive tape makes installation approachable, while the screws offer a firmer option on suitable frames. Neither method substitutes for confirming that the switch and magnet align correctly.

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Buying Guide – How to Choose the Best Magnetic Contacts for Doors

Choosing a magnetic door contact involves matching mounting constraints, electrical behavior, operating range, and environmental demands to the opening and alarm system. The following factors help narrow the options without overlooking essential installation details.

Normally Closed Wiring Compatibility

Confirm NC compatibility before ordering, especially when expanding an existing mixed-brand system.

Mounting Style and Available Space

Choose surface mounting for speed, recessed mounting for appearance, and flush mounting for a balanced discreet profile.

Operating Distance and Alignment

Do not treat the maximum stated gap as a target; consistent positioning is more important than using the full range.

Wire Type and Connection Method

Match both conductor size and connector method to the panel; a contact that works electrically may still be inconvenient to wire.

Door Material and Environment

For metal or garage doors, prioritize robust housings, suitable sensing range, and a mounting method that withstands movement and vibration.

Installation Method and Included Hardware

Use adhesive only after testing the surface; use screws when vibration, frequent servicing, or exposed conditions are likely.

Package Size and Project Scale

Purchase by the number of monitored openings, and check whether expansion may require a different mounting size or cable specification.

Electrical Ratings and System Integration

Verify system voltage, input type, and contact ratings before installation, and never connect a low-voltage sensor directly to mains electricity.

How to Use and Care for Your Magnetic Contacts for Doors

Begin by identifying the switch, magnet, panel input, and required wire type. Confirm that the alarm or access-control system is designed for NC contacts and that its electrical limits match the sensor. For a recessed or flush model, mark the 3/8-inch or 3/4-inch mounting location accurately before drilling, keeping the switch and magnet in a straight line across the closed door.

Mount the switch on the stationary frame and the magnet on the moving door, following the manufacturer’s polarity or position guidance where available. Clean adhesive surfaces thoroughly before applying double-sided tape, or tighten the supplied screws without over-tightening them. Route wires away from moving hinges, sharp edges, moisture, and places where the door could pinch the cable.

Test the installation by opening and closing the door through its normal range while watching the panel or connected input. Adjust the magnet position if detection is inconsistent. Periodically inspect the mounting screws or adhesive bond, check for worn insulation, and confirm that the magnet remains aligned after seasonal movement, settling, or repeated use.

Frequently Asked Questions

What is an NC magnetic contact for a door?

An NC magnetic contact is a normally closed wired switch that completes its circuit when the magnet is near the sensor. When the door opens and the magnet moves away, the circuit becomes nonconductive, allowing a compatible alarm panel to register the opening. Always confirm that the receiving system expects this particular wiring arrangement.

Are magnetic door contacts suitable for metal doors?

They can be, provided the selected model has enough operating distance and the magnet is positioned accurately. Metal can affect alignment, and flush models with a stated range of more than one inch may offer useful tolerance. Test the closed-door position and adjust the magnet if the panel does not respond consistently.

How far apart can a magnetic contact be installed?

The acceptable distance depends on the specific product’s stated actuation range. Some residential contacts operate within a relatively narrow range, while heavy-duty garage models are designed for gaps of at least 50 millimeters or up to 1.97 inches. Use the product’s stated figure rather than assuming that the maximum range is equally reliable in every installation.

Can I install a magnetic contact with double-sided tape?

Yes, when the surface is clean, smooth, dry, and compatible with the adhesive. Tape can simplify installation, but screws may be more dependable in high-traffic, damp, dusty, or frequently disturbed locations. Several packages include both methods so the installer can choose according to the frame and environment.

Do I need an alarm panel to use a magnetic door contact?

A panel or other compatible input is required to interpret the contact’s changing circuit state. A magnetic contact is generally a sensor rather than a standalone alarm, light, or door opener. The controller, power supply, wiring, and programming may need to be supplied separately depending on the product.

Can one magnetic contact operate a door opener or LED?

The product information for several models identifies alarms, LEDs, and door openers as possible compatible applications, but the controller and electrical specifications must match. A low-voltage contact may be unsuitable for directly switching a larger load. Use an appropriate relay or interface when required rather than exceeding the contact’s current, power, or voltage ratings.

Are recessed magnetic contacts better than surface-mounted ones?

Recessed contacts can look cleaner and may be less exposed to impact, but they require accurate drilling and are harder to reposition after installation. Surface-mounted contacts are generally faster to install, easier to inspect, and more flexible for temporary or retrofit projects. The best choice depends on appearance, frame material, and installation access.

How do I fix a magnetic contact that triggers intermittently?

Check that the magnet and switch are correctly aligned, that the closed-door gap matches the operating range, and that either the tape bond or mounting screws remain secure. Inspect the wiring for pinching or loose terminals and test the panel input with the door moved through its full travel. Replace or reposition the sensor if the fault persists.

Final Thoughts on Choosing the Best Magnetic Contacts for Doors

The Magnetic Door Switch RC-33 is the strongest all-around choice for general wired use, combining a 4.7 rating, five sets, recessed installation, and clearly stated electrical specifications. The 5 Pack Cylindrical Contact provides a budget-friendly, low-profile solution for wood doors and windows, while the Heavy Duty Garage Contact stands out for its zinc alloy construction, adjustable bracket, and larger operating gap.

Prioritize NC panel compatibility, mounting method, operating distance, and environmental demands before considering package quantity. Flush or recessed styles suit appearance-conscious installations, adhesive and screw contacts serve general retrofit work, and rugged garage models are better for roller shutters and large moving doors. Always verify wire requirements and the complete system’s electrical limits.

Ratings and specifications are based on the information available for this guide, while product details, availability, and pricing can change. Review the current listing and manufacturer instructions before purchasing, and test each installed contact to confirm that it communicates correctly with the connected alarm or access-control system.

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