1 pcs Recessed Door Contacts NO Security Alarm Door Window Sensors With Magnetic Reed Switch. These ¾” Door Contact Position switches (DCS) Work with All Access Control and Burglar Alarm Systems
This post contains affiliate links. As an Amazon Associate I earn from qualifying purchases 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