UHPPOTE Window Door Sensor Magnetic Contact Normal Closed Wired Screw-Terminal Surface-Mount Magnetic Contact Security (5 Pack)

UHPPOTE Window Door Sensor Magnetic Contact Normal Closed Wired Screw-Terminal Surface-Mount Magnetic Contact Security (5 Pack)

• Switch Type: NC (Normal closed type)
• This Contact Works with Any Access Control or Burglar Alarm System Available
• This contact can't connect directly to power, it works with your alarm system provide a switch signal. Working current under 12V
• Great for use in family and factory window, door. etc.
• 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).