TR Sensor is an auto leveling sensor for 3D Printers that can precisely measure the tilt of your print surface. It can greatly improve the printing bed of your 3D Printer. TR Sensor features simple, smart and precise. It could work with nearly any kind of bed materials, such as woods, metals, and so on. Especially for black lattice glass. 1, Innovative Solenoid: Ultra Power Saving On idle state, while the push-pin is whether pulled out or retracted, there are not any electric current flowing on solenoid, and standby electric current in the whole device is below 15mA on average, whereas on working state, while the pin is moving in sudden about 100ms, under 300mA flows in the device. Low power consumption even further drops joule heating, preventing from heat problem. 2, wide Selection of Bed TR Sensor does not uses either optical, nor proximity (inductive/capacitive) sensor. TR Sensor is controlled by Hall Effect, providing high precision. Thus the bed material can be selected freely. 3, Optimized structure: Larger Build Size TR Sensor is a small and technology-intensive one. Build size can be set larger than other existing auto bed leveling sensor. TR Sensor uses existing RC Servo motor signal intactly, so just plug 3DTouch on the same pins after removing servo motor. Specifications: Installation: 2pc M3 15mm Screws Voltage: 6V ~ 38V Cable length: 120mm Net Weight: 60g Auto leveling sensor installation height: 2mm higher than the nozzle Wiring 3-pin: Blue (-, GND), Brown (+5V), Black (control signal) Caution Additional power supply will be needed in case your board does not supply enough amperage. Electronic devices can be damaged or even destroyed if connected to wrong polarity. [wrong terminal connect to 5V(+) and GND(-)] Please note that: If your 3D Printer is not Tronxy, you will need to do some modification to your firmware and for some control board, you may need to do some soldering work to the connector. Package list 1 TR Sensor with 120mm Cable