Thank you for viewing. The lead wire colors will be random. Please see the third photo for an image. Easy operation for motor break-in! The circuit is safe inside the case!! ⚫︎Connect to a USB adapter and adjust the voltage with the knob. ⚫︎LED: Green Input voltage: DC5v Output voltage: 1v〜24v (130 motor: DC0.6v〜5v) ⚫︎Outputs from USB 5V to around 0.6V〜25V (no load) A unit that can handle both step-down and step-up! ⚫︎The included harness is homemade. Solder uses aluminum solder. Please refer to the photos for the length. It may vary by ±1.5 cm, but the red and black colors are generally the same length. ⚫︎When operating, adjust to a low voltage and connect the motor to operate. The voltage display is a guide, so use measuring instruments if necessary. Brand new, unused, power tested for operation check. Not recommended for those seeking perfection or who are nervous. Please see my profile. #Raspberry #RaspberryPi #Arduino #Mini4WD #MotorBreakInMachine #MotorBreakInMachine #MotorBreakIn #MotorBreakIn #ConstantVoltagePowerSupply