3 pcs Door Contacts Surface Mount NC Security Alarm Window Sensors With Magnetic Reed Switch. These ¾” Door Contact Position switches (DCS) Work with All Access Control and Burglar Alarm Systems by INTELLid at N Online Agency. MPN: SDCII-3. Hurry! Limited time offer. Offer valid only while supplies last. 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 within ¾'' of the door sensor. Hence when the door opens beyond the ¾'' point the door position switch will switch from a closed signal to an open signal. When this happens the access control system or alarm
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