5 Pack Surface Mounted NC Magnetic Door Contacts Switch Sensor for Alarm

Magnetic contacts is extensively used for alarm system(panel) to detect state of door. It include a reed swap half and a magnet half . When door closed, reed swap is effected by magnet and switch ON; when door open, reed swap is effected by magnet and switch OFF, set off alarm.
Contact sort: NC
Materials: ABS plastic
Coloration: white
Pack: 5pairs/bag
Small dimension, good wanting, very best for window or wood door
Screws set up make it extra agency
ABS usually closed door contact swap, alarm when the magnet half away
Utility: door / window entry burglar alarm system
NC magnetic contact swap sensor