Door & Window Sensor

A two-piece magnetic contact that reports the moment a door or window opens — and, just as usefully, that it is still shut. Stick it on in a minute with adhesive, no wiring and no drilling. It drives the useful rules: the porch light when the gate door opens after dark, an alert if a window opens while the house is armed, the AC refusing to run against an open balcony door, and the front door fed into the Elderly Care inactivity watch.

✓ Magnetic reed contact, two-piece · ✓ Open · closed · left-open duration · ✓ Up to 2 years · ✓ Low-battery alert before it dies · SKU: NX-DOOR-001