Product Name : Magnetic Door Contacts;Contact Capacity : 0.5A(Maximum Switch Current);Voltage : 100V Rated Power : 10W;Actuation Distance : 15-25mm;Cable Length : 10 Inch / 25.4cm Size(Approx) : 2.8 x 1.5 x 1.3 / 1.1 Inch x 0.6 Inch x 0.5 Inch (L*W*H);Color : White Housing Material : ABS;Weight : 12g/Set Switch Type: NO(normal open type), circuit is connected when magnet is near the switch. The reed 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 : 4 x Magnetic Door Contacts 16 x Screws Only the above package content, other products are not included. Note: Light reflection 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.