Normally Open NO Magnetic Rolling Gate Garage Door Contact Reed Switch Product Name : Magnetic Door Switch;Contact Type : NO,Normally Open;Contact Capacity : 0.5A(Maximum Switch Current) Voltage : DC 100V;Rated Power : 10W;Action Distance : 30-40mm Each Size(Approx) : 49 x 20 x 1mm / 1.9" x 0.8" x 0.4"(L*W*H);Mounting Hole Dia. : 4mm/ 0.16";Wire Length(Each) : 54cm/ 21.3" Color : Silver Gray;Housing Material : Zinc Alloy Weight : 132g;package Content : 1 x Magnetic Door Switch 4 x Installation Screws