5pcs HC-34A NC Recessed Wire Gate Contact Sensor Alarm Magnetic Reed Switch Electronics Components 5mm x 45mm/1

5mm x 45mm/1

Compact design

Over-load and Short-circuit

* Drive Sockets: Heat-treated Chrome Vanadium Steel

Features: twisted handle

5pcs HC-34A NC Recessed Wire Gate Contact Sensor Alarm Magnetic Reed Switch Electronics Components 5mm x 45mm/1Description: 1. NC means Normally Closed: When the magnet together, the circuit is conductive( light on ); when the magnet separate, the circuit is not conductive ( light off ). When make order,pls check carefully! 2. These are the door contact sensors that are in use with any and all commercial or residential card access systems as well as all security burglar alarm system. 3. Work as an anti theft alarm, perfect for metal door and window.