Etiger ES-D3C 433MHz Door Window Alarm Sensor

Features:
*Low-consumption chip design, which can make it work long time.
*High Sensitivity. Excellent design, tiny and fashion.
*It also comes with tamper protection to ensure system integrity.
*Simply attach one piece to your door or window, and attach the other piece to the door or window frame.
*Ideal intrusion warning for homes, apartments, mobile homes, dorms, offices, hotel rooms, garages, etc.