Check the listing for details. BLTouch Smart Auto Bed Leveling Sensor. Condition: Open box. Listed at 20.00 USD. The genuine BLTouch is a very precisely tuned device and we take great pride in its value and quality. BLTouch (Auto bed leveling sensor for 3D printers) is only made by ANTCLABS(A&T) in Korea. BLTouch-Smart v3.1 : Auto Leveling Sensor for 3D Printers With BLTouch, your Open-source 3D Printer can be also a Masterpiece. BLTouch is an auto leveling touch sensor for 3D Printers based on open-source.It could work with any kinds of bed materials, such as glasses, woods, metals, and so on.https://www.youtube.com/watch?v=si7REAU-5FM★https://youtu.be/JFXXRYRnT0c?t=20m46s ----> ★ https://youtu.be/ohPhMVtxsK4?t=4m20s ----> ★ https://youtu.be/7p1ZTQGISnc?t=1m14s★https://youtu.be/_CalClYNv-k?t=3m22shttps://www.youtube.com/watch?v=3bPx5PDBLzchttps://www.youtube.com/watch?v=MdE9qHayHPEBLTouch Setting Video : https://www.youtube.com/watch?v=kh8dfugXY18 BLTouch uses the same servo signal which used in previous servo line. ■ Solenoid Push-pin Up ➡ servo signal 90Degree(ex : M280 P0 S90 ) ← PWM■ Solenoid Push-pin Down ➡ servo signal 10Degree(ex : M280 P0 S10 )■ Manual Self-test ➡ servo signal 120Degree(ex : M280 P0 S120)■ Alarm Release ➡ servo signal 160Degree(ex : M280 P0 S160) ■ Zmin Test Mode ➡ servo signal 60Degree(ex : M280 P0 S60 ) ※ BLTouch can be operated in the following condition. - One I/O(PWM or Software PWM) for control - One I/O for Zmin - GND and +5V power※ Soldering and Firmware updating might be needed on a case. Wiring : 3Pin : Brown(- , GND) Red(+5V) Orange(control signal) 2Pin : Black(-, GND) White(Zmin) Specification : Voltage : 5V Current : 15mA Maximum(Peak) Current : 300mA Case M​aterial : Polycarbonat(PC) Case Color : Semitransparent White Cable Length : 150mm Weight : 0.35 oz ( 10g ) PCB & Soldering : RoHS, Lead Free (Pb Free) Packaging List1 X BLTouch v3.1■ Spare parts - for just in case something happens1 X 3Pin Straight Pin 1 X 2Pin Straight Pin 2 X Screw & Nut & Washer 2 X Dupont Housing Shell 3Pin 2 X Dupont Housing Shell 2Pin10X Dupont Terminal