uxcell 5 Set NC Wired Security Door Window Contact Alarm Magnetic Reed Switch Product Name : Magnetic DoorSwitch;Contact Type : NC,Normally Close;Contact Capacity : 0.5A(Maximum Switch Current) Voltage : DC 100V;Rated Power : 10W;Action Distance : 15-25mm Each Size(Approx) : 64 x 13x 13mm / 2.5" x 0.51" x 0.51"(L*W*H);Mounting Hole Dia. : 4mm/ 0.16";Wire Length(Each) : 27cm/ 10.6" Color : White;Housing Material : ABS Weight : 97g;package Content : 5 Setsx Magnetic DoorSwitch20 x Installation Screws