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What is Door and Window Opening Sensor ?

Entrances and exits are your home's weakest points and to a burglar, an unsecured door or window is like a big "WELCOME" sign. That's why door sensors also known as "entry sensors," "window sensors," or "contact sensors" are some of the most popular home security devices. The earliest electronic home security system was entirely made up of door sensors when someone opened a door or window, it triggered a big vibrating bell in a central part of the home. Luckily, technology has improved since then, and homeowners are faced with a wide array of choices.

Door sensors have one reed switch and one magnet, creating a closed circuit. If someone opens an armed door or window, the magnet is pulled away from the switch, which breaks the circuit and triggers an event. Depending on your setup and what mode your system is in, this could be a discreet text, a chime alert, or a full-blown alarm. Because the technology involved in an entry sensor is so elegant, it can be used in a lot of creative ways—especially if you can program different responses for alarm events.

Advantages

Doorbell: If your system is off, it will still sound a chime if someone triggers a sensor.

Virtual Bouncer: Entry sensors don't just keep out the outside world — they can warn you about breaches within your home, too. Stick one on the entrance to the game room or the door to the liquor cabinet. Rig it up with a Secret Alert so that it only tells you if the seal is broken — so you can crack down on those rule-breakers.

24/7 Lifeguard: Install some entry sensors, and get immediate and detailed Smart Alerts sent straight to your phone whenever you need to come to the rescue.

Protecting Your Outdoor Stuff: Entry sensors are also great for protecting outdoor equipment that you can't keep inside your stronghold—an in-window air conditioner