Recessed magnetic contact no nf 3 wires detector opening door window sensor1 pair NO NC type wired window magnetic contact sensor detector window sensor magnetic switch home alarm systemApplication: access control, alarm systemWindow door magnetic contact Integrated NC NO Reed Switch contact Gap SensSetting:Output: NO NC COMDimensions: 330 11mm, cable length: 23cmGap: 15 to 25 mmelectric currency: 3W / 100VDC / 0.3A (not to exceed 0.5A)Built-in magnetic contact, ideal use of wooden door or window