Product Name : Magnetic Door Contacts; Capacity : 0.5A(Maximum Switch Current);Voltage : 100V Rated Power : 10W;Actuation Distance : 15-25mm;Cable Length : 10 / 25.4cm Size() : 2.8 x 1.5 x 1.3 / 1.1 x 0.6 x 0.5 (L*W*H);Color : White Housing Material : ABS;Weight : 12g Switch Type: NO(normal open type), circuit is connected when magnet is near the switch. The switch is an electrical switch operated by an applied magnetic field. Designed for use with alarm systems. Great for use in family and factory window, door. etc. With double-sides tape design that for easily install. package Content : 1 x Magnetic Door Contacts 4 x Screws Note:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.