SPECIFICATIONS PL-08N2 Square Proximity Switch Inductive Sensor Metal Switch Three-wire NPN Normally Closed DC 6V 36V Wire length: 1.5m Voltage: DC6-36V Model Number: PL-08N2 Material: acrylic Item Type: Switches Is Smart Device: NO Detection distance: 8mm Product Information Model:PL-08N2 Wire length:1.5m Detection distance :8mm Size:17*17*35mmVoltage:DC6-36V Detected object :Metal( The lower the iron content, the closer the induction distance.) IP67 Protective Structure Detection distance description:The inductive proximity switch detects only metals.Different metal, different detection distance, for pure iron .The induction surface should be cleaned regularly to avoid affecting the induction performance. NPN NC: It means that the black line is the output negative voltage signal under normal condition. When the object is detected, the output signal is disconnected.