433Mhz Door Window Alarm Sensor

Features:
*Wireless 433MHz door sensor, for installed in the door or window to monitor the door/window switch state if it is opened or moved.
*Simply attach one piece to your door or window, and attach the other piece to the door or window frame.
*High Sensitivity. Excellent design, tiny and fashion. Easily install.
*Ideal intrusion warning for homes, apartments, mobile homes, dorms, offices, hotel rooms, garages, etc.
*Low-consumption chip design, which can make it work long time.