Feature: Pulse width modulation(PWM) is used to make the speed more stable, and the strength is high at low speed. The product is made of high-quality electronic components with stable and reliable performance. The product is compact and easy to install in narrow space. The input voltage of the product is within the range of DC 12-60V and the applicable current is within 20A. This is a DC brush motor controller. Please don't use it on AC motors. Specification: Input voltage: DC12-60V Output voltage: linear under load Maximum current: 20A Continuous current: 12A Speed range: 0%--100% Control frequency: 15Khz Speed control mode: potentiometer Speed control type: current adjustment Forward rotation reverse: not supported Digital positioning: 0-100 full speed percentage Support motor: DC brush Wiring type: screw terminal Potentiometer line length: 20cm Digital display line length: 20cm Product size: 70*50*24mm (L*W*H) Installation size: 44mm*2 holes (mounting holes straight through 3mm) Package list: 1 * Motor Speed Controller Note: 1. The digital display only shows 0 to 100, the number is the motor full speed percentage, non-motor actual speed. 2. The input voltage should be equal to the rated voltage of the motor. It is not possible to input 220V household electricity. 3. Input must distinguish between positive and negative polarity.