Specification Brand : Tomotato BulletPoint1 : WORKING PRINCIPLE --- Close = short circuit = create a path for the current.The magnets are close together and the switch is off. And the switch and magnet are separated, and the switch is open. BulletPoint2 : MATERIAL --- The switch housing is made of ABS flame retardant material and reed switch, is resistant to high temperature and deformation. BulletPoint3 : FEATURE --- No external power supply is needed, and the GND and N.C ports of wired or wireless alarm control panel are directly connected. BulletPoint4 : APPLICATION --- Work with all access control and burglar alarm systems. Can be installed in wooden or aluminum alloy doors and windows. Not suitable for iron doors, it will reduce the magnetism of the sensor. BulletPoint5 : SERVICE --- We are always here to provide professional customer service before and after your purchase. Please contact us first if you have any questions. Color : default ExternallyAssignedProductIdentifier1 : 0735384263306 ExternallyAssignedProductIdentifier2 : 735384263306 FinishType : Finish IncludedComponents : inc ItemName : 10pcs Wired Magnetic Switch, Recessed Security Window Door Contact Sensor for Home Alarm System - White ItemPackageQuantity : 1 ItemTypeKeyword : home-security-systems Manufacturer : Tomotato Material : Material Material1 : Rubber Material2 : Plastic Material3 : Stainless Steel NumberOfItems : 1 PartNumber : Tomotatohfso62y81w PowerSourceType : PowerSource ProductDescription : Specifications: Working Distance: 15mm + 5mm Switching Pressure: 100VDC Load current: 300 mA Life: 1 million times Switch Output: NC (Normally Closed) Package Weight: 91g/3.2oz