Product description: 
 
Smart ZigBee Door & Window Sensor: Just add the sensor to the ZigBee hub.
Real-time remote monitoring: Once the door and window sensors detect an external object, you will be notified via the app.
Wide Applications: Apply smart door and window sensors to different scenarios and easily integrate into various environments.
Battery Powered for Low power consumption: newly designed with hall sensing technology and tamper protection
Easy Installation with Double-sided Tape: simply stick it anywhere you like to protect your house security
 
Technical Specification:
 
Wireless Technology: ZigBee
Working Voltage: 2.4V-3.3V(CR2032 battery)
Transmission Frequency: 2.4GHz
Working Temperature: ‒20°C ~+60°C / 0%~95%RH
Transmission Range: Indoor:10~30m/Outdoor:30~50m
Size Main Body: 40*25*12mm
Size Small Body: 25*10*9mm