The speed controller, potentiometer, and switch are enclosed in an aluminum alloy housing, making it easy to use and install. Simply screw the speed controller to the countertop for quick and easy installation. Wiring is simple, with only two power cables and two motor cables. Connect the DC motor speed controller to the DC power supply, Never directly connect to household 220V AC, Otherwise the damage is at your own risk! Note that this is not a power module, it must be connected to the motor to adjust the speed, and the output of the multimeter not change without the motor. The motor can be connected regardless of positive or negative. When the running direction is inconsistent with the expectation, the direction can be changed by adjusting sequence. Product parameter: Input voltage: DC 9V-60V (Cannot be connected to household electricity) Output voltage: linear under load Output current: 0-20A (with a long-term use of 10A, pay attention to keeping the module unobstructed and cooling conditions) Ultimate power: 1000W Speed regulation type: PWM regulation Speed regulation method: potentiometer (linear) Speed adjustment range: 0-100% Control frequency: 25KHZ Forward and reverse: support Installation size: The center distance of the fixed hole on the back is 105MM Potentiometer according to the installation opening: 7MM Please note: 1. This speed governor is used for DC brushed motors. 2. It is not suitable for the speed regulation of brushless DC motors; nor can it be used as a voltage regulator or regulator! Color: Silver Material: Aluminum Alloy Package Contents: 1* PWM 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.