10pcs RC-33 NC Recessed Wired Window Door Contact Sensor Alarm Magnetic Reed Switch White Wire Rope Sleeves Rod Length: 30mm /1

Rod Length: 30mm /1

The rubber has large elasticity and is light and high

When the nut is locked

has  no odor

10pcs RC-33 NC Recessed Wired Window Door Contact Sensor Alarm Magnetic Reed Switch White Wire Rope Sleeves Rod Length: 30mm /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 burglar alarm system. 3. Work as an anti theft alarm, perfect for metal door and window. Specification: