Features: 1.NO NC Switch: The magnetic switch has a normally closed function. When the two parts are combined, the switch is turned on, and when they are separated, the switch is turned off. Normally open function is the opposite. 2.Application: Magnetic contact sensor switch can be added to existing wired alarm system, suitable for wooden doors or windows, ideal for protecting doors. 3.High Sensitivity: The use of high magnetic magnets and reed switches makes the magnetic contact switch more sensitive and efficient. 4.Safe Material: The magnetic reed switch adopts ABS engineering fire retardant and flame retardant material, which is safer and more convenient to use. 5.Easy Installation: The door magnetic switch adopts surface mount and screw installation method, and the installation is convenient, dependable to use. Specification: Item Type: Magnetic Reed Switch_x005f_x000D_ Material: ABS, Magnet_x005f_x000D_ Scope of Application: Door Frame, Wall, Door_x005f_x000D_ Connection Method: Screw Connection_x005f_x000D_ Output Type: Normally Open, Normally Closed (NO/NC)_x005f_x000D_ Induction Distance: Approx. 20-30mm / 0.79-1.18in_x005f_x000D_ Installation Method: Surface Mounted, Screw Installation_x005f_x000D_ Current Voltage Power: 0.5A 10V 10W_x005f_x000D_ Size (One Side): Approx. 55x13x11mm / 2.17x0.51x0.43in PackageList: 4 x_x005f_x000D_ _x005f_x000D_ Magnetic Reed Switch 8 x Screw