ITEM NAME:2Pcs NJK-5001C NPN NO 10mm Hall Effect Sensor Proximity Switch DC 6~36V L2Z3 2Pcs NJK-5001C NPN NO 10mm Hall Effect Sensor Proximity Switch DC 6~36V L2Z3 Product Name:Hall Effect Sensor Proximity Switch Model:NJK-5001C Theory:Hall Effect Sensor Wire Type:3 Wire Type (Brown, Blue, Black) Switch Appearance Type:Block Type, Aluminum Shell Output Type:NPN NO(Normally Open) Detecting Distance:10mm Supply Voltage:6-36V DC Detect Object:Magnetic material Diameter/Length:8mm/30mm Cable Length:1.2M/3.5Ft Material:metal Colour:Silver Quantity: 2 pcs Package Contents: 2 x Hall Effect Sensor Switch Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.