DSYBJR Surface Mounted NC Magnetic Contacts Switch Model 37 Plastic White 5 Sets Cable Organizers providing all-around protection for your

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DSYBJR Surface Mounted NC Magnetic Contacts Switch Model 37 Plastic White 5 Sets Cable Organizers providing all-around protection for yourThese DSYBJR surface mounted magnetic contacts are designed for home alarm systems to detect the open or closed status of doors and windows. They operate as normally closed (NC) switches, meaning the circuit is closed when the door is shut and opens when the door is opened. This product cannot work alone and requires connection to an alarm system. Features: * NC type: Closed loop when door is closed, open loop when door is open * Over 1 2 inch long