UHPPOTE NC Magnetic Alarm Door Window Contact Sensor (20 Pack)

This pack of 20 UHPPOTE Wired NC Normally Closed Type Magnetic Alarm Door Window Contact Sensor Detector Reed Switch is perfect for use in family and factory windows, doors, etc. The switch type is NC (normal closed type) which means when the magnet is together, the circuit is conductive (light on) and when the magnet is separate, the circuit is not conductive (light off). It is easy to install with a screw surface mount contact and works with any access control or burglar alarm system available. Get this pack of 20 and ensure your family and factory are safe and secure.