1、Push alarm information to protect your home through door opening/closing detection. Home security alarms make the house safer. 2、Easy to install, no need to use complicated tools during installation, just use glue to install, firm and durable. 3、Quick response, low power consumption, with smart gateway, long battery life, powered by lithium battery, can be used for 1 year on a single charge. 4、When turned on or off, the sensor will immediately push notifications to your phone. You can clearly know if anyone has entered your home, store, office, etc. 5、It is convenient for you to detect your doors, window, cabinets, drawers and other places, and you will be notified of the status of the location when you open or close it. 1 x Sensor1 x Magnet1 x Charging Cable1 x Reset Needle1 x Chinese and English Manual Item Type: Door DetectorWeight: Approx. 72g / 2.5ozSensor Size: Approx. 73 x 27 x 20 mm / 2.9 x 1.1 x 0.8 inMagnet Size: Approx. 36 x 12 x 15 mm / 1.4 x 0.5 x 0.6 inBattery Capacity: 3.7V lithium battery 450mAh (Battery Included)Working Temperature: -40℃~85℃ (industrial grade)Working Humidity: <85%RHConnection Method: For ZigBeeCharging Voltage: DC 5VWireless Connection: WiFi 2.4GHzCharging Time: 1.5HDistance Between Magnet and Sensor: 5~22mmWorking Hours: 2500+ timesFunction: Anti-dismantling alarm function; connect through the mobile app, if the alarm is triggered, it will be pushed to the mobile phone immediately