Wired Door Window Contact Magnetic Sensor Intrusion Detector

Features:
*This sensor can't work alone, it needs to work with wired alarm host or other wired devices.
*Simply attach one piece to your door or window, and attach the other piece to the door or window frame.
*Low-consumption design, more power-saving.
*Excellent design, tiny and fashion. Easily install with screws.
*Ideal intrusion warning for homes, apartments, mobile homes, dorms, offices, hotel rooms, garages, etc.