3 Pcs NO Roller Shutter Door Contact Alarm Magnetic Reed Switch Product Name : DoorMagneticSwitch;Contact Type : NONormally Open;Contact Capacity : 0.5A(Maximum Switch Current) Voltage : DC 100V;Rated Power : 10W;Action Distance : 50-70mm Detector Size : 106mm x 38 x 10mm/4.2" x 1.5" x 0.4"(L*W*H);Magnet Size : 106 x 16x 15mm/ 4.2" x 0.63" x 0.6"(L*W*H);Mounting Hole Dia. : 6mm/ 0.24" Wire Length(Each) : 50cm/ 19.7";Color : Silver Tone;Housing Material : Zinc Alloy Weight : 361g;package Content : 3 x DoorMagneticSwitchSome Installation Screws