Support motor: DC brush motor Forward and reverse: support Speed range: 0--100% Control frequency: 15KHZ Wiring Type: Terminal Knob specification: 100K (with switch) Wiring Type: Barrier Terminal Blocks Motherboard size: 100MM x 76MM x 28MM Shell size: 110x78x38MM Note: The digital display is the motor full speed percentage 0-100, not the actual speed of the motor The input voltage must be divided into positive and negative The input voltage should be equal to the rated voltage of the motor within 10-55V DC Make that the positive and negative connections are correct before powering on, and the wiring should not touch the heat sink, which may burn the circuit board. Note that this is not a power module, and the motor must be connected to adjust the speed. If the motor is not connected, the output of the multimeter will not change, and it cannot be connected to AC. For brushed motors. Colour:As Shown Material:Metal Package Contents: 1 x DC motor speed controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.