Features:<br> <br> White surface mount magnetic contact reed switch kit with pigtail for home metal door or window security alarm system.<br> Normally closed type; when the switch and magnet are close to each other, the switch is closed, otherwise it will be open.<br> The reed switch is an electrical switch operated by an applied magnetic field.<br> Designed for use with alarm systems.<br> Suitable for use in residential and commercial windows, doors, etc.<br> Includes double-sided tape for easy installation.<br> <br> Note:<br> No external power supply required; connect directly to wired or wireless alarm control panel GND and N.C ports.<br> This item is not suitable for iron doors, as it may reduce the sensor's magnetic performance.<br> <br> Specifications:<br> Item Type: Door Sensor Magnetic Switch<br> Material: ABS<br> Model: MC-31<br> Color: White<br> Size: 6.22cm / 2.44in (Approx.)<br> Actuation Distance: 16mm<br> Rated current: 100mA<br> Rated voltage: 100V DC<br> Operating distance: more than 15mm, less than 25mm<br> Rated power: 3W<br> Connecting mode: NC (normally closed)<br> Quantity: 1 Set (other accessories shown in the picture are not included)<br> <br> Notes:<br> 1. Conversion: 1cm = 10mm = 0.39 inch<br> 2. Please allow 0-1cm error due to manual measurement. Please ensure you are comfortable with this before purchasing.<br> 3. Due to differences in monitor displays, the image may not reflect the actual color of the item.<br> <br> Package includes:<br> 5 Pairs x MC-31 Wired Door Window Sensor (no retail packaging)<br> 20 x Screw