Uxcell a11021800ux0169 SN04-N DC 10-30V 200mA NPN NO 3-wire 4mm Approach Sensor Inductive Proximity Switch Product Name : Proximity Switch Sensor; Model : SN04-N;Type :NPN No; Theory : Inductance Sensor; Wire Type:3-Wire Output : Switching Transducer; Sensing Distance : 4mm (+/-10%);Working Voltage : 10-30V DC; Switch Appearance Type: Rectangle Type Response Frequency : 500Hz max; Indicator : Red LED; Size : 18 x18 x 36mm/0.7" x 0.7" x 1.4"(W*H*L) Cable Length : 135cm/53";Hole Size : 0.9 x 0.4cm/0.35" x 0.2"(L*W);External Material : ABS Resin Net Weight : 48g;Color : Black, Green; Package Content : 1 x Proximity Sensor Switch,2 x Screws