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Door Sensor

Your first line of defense.

Doors are the most common entry points into a home. Stop burglars before they get inside with our compact and reliable door sensor.


How to Install Your Door Sensor

Tech Specs

SENSOR DIMENSIONS2.13" x 1.00" x 0.50"
MAGNET DIMENSIONS2.11" x 0.41" x 0.46"
WEIGHT0.915 oz
OPERATING HUMIDITY5-90% Non-Condensing

Frequently Asked Questions

In one-third of all home break-ins, the burglar entered through the front door— oftentimes, because the door is unlocked. It’s a good precaution to keep your home locked while you're away. If you happen to forget to lock a door or window but you have an active alarm system, then an intruder will likely be scared off by the alarm. Furthermore, the authorities will be notified and arrive shortly. Good wireless sensors for your doors paired to a professional alarm system are an effective deterrent against theft and burglary.

A door sensor is an essential part of a home security system to keep your home safe. A door sensor keeps track of whether a door is open or closed. These alarms alert you either audibly and/or with a text notification when a door has been opened (depending on your settings). With a door sensor you can know that your home is secure and that no one is coming or going without your knowledge. The same technology used for door sensors can also be used on windows. This technology is simple, reliable, and affordable, which makes it ideal for DIY home security systems.

Door alarms can be wired or wireless, although wired models are quickly becoming outdated. The hassle involved in installing wired alarm systems usually requires many hours of setup time by a trained professional. This can be an expensive nuisance.

Wireless Door Alarms

The door sensors we recommend are wireless and can be set up by the customer in mere minutes. Since we want our customers to have the best, wireless door alarms are the only type of door sensors that Cove offers.

But how does a wireless door sensor work? The sensor itself is a two-piece device. One part of the wireless door alarm is attached to the edge of the door and the other part is attached to the door frame. Both parts are mounted with an adhesive strip. The two pieces are parallel with one another, almost touching. When the door is opened, it breaks the invisible connection between the two parts of the sensor, tripping the alarm.

To elaborate, one part of the sensor has a magnet inside, and the other part contains a magnetically sensitive trigger called a "reed switch." The reed switch houses two magnetic wires that are prevented from completing a circuit when it’s sister piece is next to it. When the part of the door sensor that contains the magnet moves away from the other half of the sensor, the two wires of the reed switch are able to touch, which triggers a signal to your Cove Touch Alarm Panel. If the sensor is tripped, and your system is armed, an audible alarm on the panel will go off. If your system is not armed, your alarm panel may chime or announce the name or location of the sensor, according to your preference. You can also have your alarm system send you an alert when a door is opened if you have the Cove app. These settings can be customized on the alarm panel or within the app, according to your personal preferences. Because this type of door alarm is wireless, these door sensors must run on battery power. But fret not, the batteries for the door and window sensors in the Cove Home Security System are rated for a lifespan of more than 5 years. Also, you can always check the battery life status of your wireless security devices on the touchscreen display of your Cove Touch Alarm Panel.

Although wireless door alarms are very easy to set up, don't let their simplicity fool you into thinking they're easy to bypass. Because they're so small and don't require direct contact, the two halves are almost always out of view from the outside of the door. This means shady characters won't be able to know where the sensor is located. Even if an intruder did know where your sensor was, it isn't possible to disable them from the outside. The door only needs to move about an inch to trip the alarm and tampering with the sensor will set off the alarm.

Button Door Alarms

Other security companies use a door alarm that is triggered by a button rather than a magnet. When the door is closed, one half of the "sensor" depresses a button that protrudes from the other half. When the button is pressed, the alarm system reads the door as closed. When the door is opened, the button pops up like a turkey timer and sends a signal to the system to register that the door or window assigned to that sensor has been opened.

The advantage and disadvantage of a button door alarm is it’s simplicity. If there's a wide enough gap between your door and frame, the button can be seen from the other side and a burglar can neutralize the device by sliding a credit card through and applying pressure to the card to keep the button depressed as they open and close the door.

This is why we recommend magnetic sensors. As we mentioned above, magnetic door alarms can't be seen from the outside of a door and are more reliable.Furthermore, buttons wear down after a while, and if they aren't installed properly, they can even break with a forceful slamming of a door or window. Since magnetic door alarms don’t have any moving parts you can avoid this risk of premature hardware failure unlike their button cohorts.

Also, with the button door alarm, you hear a click every time the door opens or closes, which can be annoying. Since a magnetic door alarm needs no physical contact it can be completely silent. If you do want some sort of noise to be created when your doors are opened you can always activate the chime function of the door alarms but this way you at least have a choice whether you want your security system to make a sound or not.

Wired and Professionally Installed Door Alarms

Wired door alarms are effective only as long as they have power. Since wired door alarms are reliant on the same power as the rest of your home, then your whole alarm system will shut down if the power goes out. With wireless door alarms and a wireless security system, even if the power goes out, you can be assured that your alarm system will still work since it runs on long-lasting batteries.

Some individuals like to have a recessed sensor so that the door sensor doesn’t ruin the aesthetic of their home but recessed door sensors take longer to install, and become a permanent fixture in your door even if you decide to change security companies. With Cove’s wireless door sensors, you won’t have to worry about this. Cove’s door alarms are designed to be unobtrusive. Plus, their design also makes it so even a thief directly outside the door won’t be able to see them.

If your home or apartment is already pre-wired for an older security system it may be tempting to pay for a wired alarm service but you should still look into modern wireless door sensors. Even the best wired alarms can be easily disarmed if the burglar knows what he/she is doing. Also, even if the wiring is already in place, in many cases, it may actually be cheaper to buy diy wireless door alarms instead of having someone come in to set up, replace, or reactivate the wired alarms that are already present.

A door sensor is essential to the safety of your home. We recommend sensors be installed in every possible access point to your home. You’ll want them installed on all doors and windows so that there is no way a thief, burglar, or home invader can enter your home without triggering an alarm. Door alarms and window sensors are an essential part of a complete home safety system. Sensors on any possible entry points keeps you and your security monitoring service in the know about any potential threats, so that you'll be protected.

To begin deciding on how many door alarms you need, assess the layout of your home. Get to know how your windows open and how your doors lock and what they look like from outside the house. Case your own home like a potential burglar would, and you'll have a good idea of where and how many magnetic door alarms or window sensors you'll need.

Once you know how many wireless door and window contact sensors you'll need, you'll want to find a security company that offers the best door alarm sensors as part of a comprehensive monitored package. In order to get the best results and the least amount of headache, you'll want your hardware to come from the same security company. Cove will provide you both affordable security equipment and unbeatable alarm monitoring. If there ever happens to be a security threat at your residence, Cove will be alerted, able to verify the threat, and contact emergency services on your behalf if the situation requires it. We’re committed to providing effective security without breaking your bank.

Why bother with complicated wired systems or unreliable button sensors when you could take control of your home's safety with simple, dependable, wireless alarms?

Cove’s door alarm sensors are simple, yet so reliable and affordable that they're a no-brainer for a home security system. Their small form factor makes them unobtrusive and practically unnoticeable in your house or apartment. They can also easily be relocated to a more convenient or effective position around your door or window, or to a different window or door entirely. Put them wherever they best fit your needs.

Having a Cove security system with door alarms in place can be an excellent deterrent for crime. When you order your alarm system, you'll also be provided with a yard sign and window stickers to warn intruders that your abode is protected.

If you want a system that gives you complete control over your devices and how you use them. Then Cove’s system is right for you. Below are a few of the customizations you can set up with Cove’s door alarm system.


With the Cove Touch Panel, you can arm the entire system all together or bypass some of your doors and windows. If, for example, you were having a barbecue in the backyard with friends coming in and out of the kitchen through the back door, you could set the system to bypass the back door, but arm everything else, so you can keep playing host and grill master while knowing your front door is secure.

Even when your system isn't armed, the door and window sensors are keeping tabs on the status of your entry points. You can set up your alarm panel so that it will chime or announce the door or window that has been opened to keep you aware of the comings and goings in your house. When you add door sensors to your security system, you are able to name each sensor so that when this setting is active you know exactly which door or window has been opened, triggering the control panel to speak. Since the Cove alarm panel has a large touchscreen display, it can also tell you visually which devices are open or closed, as well as other status updates like battery life and proper function.

When the system is armed and a sensor is tripped, an alarm will sound to alert the house to the possibility of a break-in. This loud alarm tone also warns intruders that they've triggered an armed security system, scaring them off.

Cove is an affordable and reliable home security system which you can cancel any time at no cost. No contracts, no fuss, no worries.