Uxcell a14060400ux0169 Alarm Security System NC Normally Close (Pack of 5) Product name: magnetic door switch; contact type: nc, normally close; contact capacity: 0.5A(maximum switch current) Voltage: 100V; rated power: 10W; actuation distance: 0-15mm; size(approx.): 2.7 x 1.5X 0.8Cm/ 1.1" x 0.6" x 0.3"(L*w*h); color: white Hole diameter: 3.5Mm/0.14"; hole distance: 1.7Cm/0.67"; cable length: 38Cm/15"; housing material: abs