WESUA 5 Pack Magnetic Contacts Switch Window Door Sensor for Alarm System NC 3/8″

Magnetic contacts is widely used for alarm system(panel) to detect state of door. It consist of a reed switch part and a magnet part . When door closed, reed switch is effected by magnet and turn ON; when door open, reed switch is effected by magnet and turn OFF, trigger alarm.
Contact type: NC
Material: ABS plastic
Color: white
Pack: 5pairs/bag