3 pcs Wired White Door Contacts Surface Mount NC Security Alarm Window Sensors.These ¾ inch Contact Position switches (DCS) Work with All Access Control and Burglar Systems sold2024 making it ideal for those

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3 pcs Wired White Door Contacts Surface Mount NC Security Alarm Window Sensors.These ¾ inch Contact Position switches (DCS) Work with All Access Control and Burglar Systems sold2024 making it ideal for those3 pcs Wired White Door Contacts Surface Mount NC Security Alarm Window Sensors. These inch Contact Position switches (DCS) Work with All Access Control and Burglar Systems 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. The door position switches operate with a built an internal magnetic reed switch that closes when the opposing magnet comes