Wadda's inductive proximity sensor detection switch accurately detects metal objects that are within 4 mm of the sensor head. When a metal object is detected, the built-in red LED lights up and the black signal wire is internally shorted to ground through an Npn transistor. When no object is detected, the signal is floating/high impedance. Note: It is recommended to supply the sensor with a maximum of 6 V, and to put a series protection resistor between the signal output of the sensor and the digital input of your board when connected to 5 V logic, such as Arduino-compatible® boards. . Basic product information: •• Operating instructions Language: English •• Primary colours: Black •• Additional colours: Blue, Grey •• Additional detailed colours: Metal •• Depth unit: 3.5 cm •• Height unit: 15.5 cm •• Unit width: 7.5 cm •• Weight unit: 69 G • Technical data: •• Specifications Kit & Modules: Supply voltage: 6 - 36 V DC Max. Current: 300 Ma Sensor model: Lj12A3-4-Z/Bx Detection distance: 4 mm Output signal: Npn (high impedance when no object is present, or ground when object is detected) • Operational characteristics: •• Coding level: 2 •• Electronics skill level: 1 •• Mechanics skill level: None •• Soldering skill level: None