ESP Fort Door & Window Contact Sensor for Smart Home Alarm Sytem - ECSPCT Protect your fortress with the all new ESP Fort Smart Home WiFi Security System. Seamlessly link a wide range of smart home security lights, cameras, doorbells and motion sensors to keep tabs on all corners of your house, all through an easy-to-use app on your mobile phone! ESP are pioneers in home security solutions in commercial and domestic settings, so their reputation can be trusted, giving you the peace of mind at night or when you leave the house for a holiday. Get instant updates on the status of your system directly to your mobile phone and access live camera footage, all without the hassle of monthly fees and third party apps. This door/window contact sensor is a pivotal piece in the all new modular FORT Smart Alarm System from ESP. This sensor detects changes in the proximity between a transmitter and magnet to alert you when a window or door has been tampered with. Attach the sensor to the side of a door or window frame using the mounting screws, wall plugs and magnet spacers provided, for a perfect alignment, even on recessed doors/windows. Each sensor is battery powered (batteries included) meaning they can be placed in a room of your choice and away from an active power source. With the click of a button, each sensor connects to the Smart Alarm Hub (sold separately) via radio frequency, from a distance of up to 80m (clear field of view). The whole system can be monitored, armed and disarmed on the go, through the ClickSmart+ mobile app due to the Smart Alarm Hub\'s 2.4GHz WiFi capability and Sim card support.  Key Features Smart Alarm Door/Window Contact 80 Meters Open Field RF Transmission (433Mhz) Requires Smart Alarm Hub (ECSPHB) Suitable for Doors & Windows Battery Powered (Supplied) Low Power Indication Tamper Protection CR2477 Battery included Mounting screws and wall plugs provided Sensor Dimensions: 55.7mm x 30.3mm x 16mm Magnet Dimensions 25mm x 10mm x 9mm