ITEM NAME:SN04-N 4mm Inductive Proximity Sensor Detection Switch NPN NO DC 10-30V tdT p Gw Package Included:.Output Type : NPN, NO. Sensing Distance : 4mm. Output : Switching Transducer. Indicator : Red LED. Theory : Inductance Sensor. Wire Type : DC 3 Wire Type (Brown, Black, Blue). Size : 36 x 18 x 18mm (L W H).