Features: Made of high quality housing material, which is reliable, sturdy and durable with long service life. It can be used even if the power or the network is cut off, a good guard for your home security. Small and compact appearance, reasonable size, which bring you convenience, beauty and enjoyment. It can be connected by mobile phone APP, allowing you checking the alarm record at any time in the APP, convenient to use. When someone illegally opens the door and window, the alarm immediately sounds an alarm and pushes the message to your phone. It features high sensitivity, on-site flashing red light alarm, simple operation and easy installation, easy to use. Stand-alone without external power supply, suitable for multiple places such as home, hotel, office, factory, warehouse, etc. Remote APP prompt, support for 2.4G band network, temporarily does not support for 5G. Specification: Condition: 100% Brand New Material: ABS Battery: Built-in One Rechargeable 500mah Lithium Battery Standby Current: ＜25uA Battery Life: 5 Years Sensitivity: 0.0002%m/obs Operation Temperature: -10℃~55℃ Alarm Sound Time: Continuous Alarm, 30 Seconds Each Time Alarm Sound: 65DB Product Size: Door Sensor: Approx. 87*35*16.5 mm / 3.4*1.4*0.6 in Door Magnetic: Approx. 13*13*47 mm / 0.5*0.5*1.9 in Package list: 1 * Magnetic Door Sensor (Built-in One Lithium Battery) 1 * User Manual 2 * Rubber Mat 1、Made of high quality housing material, which is reliable, sturdy and durable with long service life 2、It can be used even if the power or the network is cut off, a good guard for your home security 3、Small and compact appearance, reasonable size, which bring you convenience, beauty and enjoyment 4、It can be connected by mobile phone APP, allowing you checking the alarm record at any time in the APP, convenient to use 5、When someone illegally opens the door and window, the alarm immediately sounds an alarm and pushes the message to your phone