ITEM NAME:5 Set Screws Mounted Alarm Contacts Magnetic Switch for Door Window H3G4 5 Set Screws Mounted Alarm Contacts Magnetic Switch for Door Window H3G4 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. Product Name : Magnetic Door switch; Contact Type : NO; Contact Capacity : 0.5A(Maximum Switch Current) Voltage : 100V;Rated Power : 10W; Actuation Distance : 0-15mm Hole Diameter : 4mm/0.16"; Hole Distance : 5.3cm/2.1"; Cable Length : 27cm/10.6" Size(Approx) : 6.5 x 1.3x 1.3cm/ 2.6" x 0.5" x 0.5"(L*W*H); Color : White; Housing Material : ABS Weight : 99g; package Content : 5 x Magnetic Door switch Note:Light shooting 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 +/-1-3 cm.