Main Features: Original Xiaomi Aqara smart door and windows sensor for daily security ZigBee wireless connection Trigger and alarm: it will light and ring when someone open the door, the light will automatically turn on when someone push the door Away from home mode: If someone broke into, the bell will ring and the IP camera ( not included ) will take video Intelligent sensors: open the window let fresh air into room Small size, easy to install Max. sensing distance: 22mm Unique artistic Smart Home Home Home Security Alarm Unique artistic Smart Home Home Home Security Alarm Unique artistic Smart Home Home Home Security Alarm Working temperature: -10 - 50 Deg.C Working humidity: 0 - 95pct RH Built-in 1pc CR1632 cell battery Please download APP "Mi Home" from Apple Store or Google Play