Wired Metal Rolling Gate Door Window Sensor Magnetic Contacts Alarm Reed Switch Detector for Alarm Access Control System

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.
*Excellent design, tiny and fashion. Low-consumption design, more power-saving.
*Easy installation with screws on all kind of metal doors, wooden doors, glass doors, etc., very convenient.
*Ideal intrusion warning for homes, apartments, mobile homes, dorms, offices, hotel rooms, garages, etc. Also can be used as tip of door switch status for firefighting gate, shops, etc.