["Description:\r\n\r\nFeatures:\r\nbrand new and high quality.\r\nWhite surface mount magnetic contact reed switch kit with pigtail for home metal door or window security alarm system.\r\nNormally closed type, when the switch and magnet is close to each other the switch is closed, otherwise it will be open.\r\nThe reed switch is an electrical switch operated by an applied magnetic field.\r\nDesigned for use with alarm systems. \r\nGreat for use in family and factory window, door. etc.\r\nWith double-sides tape design that for easily install.\r\n\r\nNote: \r\nNo external power supply, connect to wired or wireless alarm control panel GND and N.C ports directly! \r\nPlease note that this item not fit to iron door, It will decline magnetic of the sensor.\r\n\r\nSpecifications:\r\nItem Type: Door Sensor Magnetic Switch \r\nMaterial: ABS\r\nModel: MC-31 \r\nColor: White\r\nSize: 6.2×2cm/2.44×0.79in (Approx.)\r\nActuation Distance: 16mm\r\nRated current: 100mA\r\nRated voltage: 100V DC\r\nOperating distance: more than 15mm, less than 25mm\r\nRated power: 3W\r\nConnecting mode: NC. (normally closed)\r\nQuantity: 1 Set (other accessories demo in the picture is not included)\r\n\r\nNote: \r\n1.Transition: 1cm=10mm=0.39inch\r\n2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\r\n3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\r\n\r\nPackage includes:\r\n5 Pairs X MC-31 Wired Door Window Sensor (No retail package)\r\n20 X Screw"]