new,high quality Features: The button is more precise than the traditional potentiometer, and has a long service life (1 million times). It does not automatically generate drift. The digital display shows the value 001, 002, 003...100, which means the maximum running speed of the motor. Start slowly, reach the set speed, prevent the starting current from being too large, damage the power supply by instantaneous impact, damage the motor, damage the machine light and other unwanted phenomena. Using single-chip technology to adjust speed is more smooth and smooth than traditional 555 chip, good linearity, low noise and long service life. Specifications: Item Type: Motor Speed Controller Material: for Shell ABS Input voltage: 12V-24V DC PWM frequency: 15KHz Speed adjustable range: 0%- Working current: 5A Working current: 8A Working Power: 12VX5A=60W, 24VX5A=120W Size: 7x5x2cm/2.76x1.97x0.79in Color: Gray Quantity: 1 Pc The display range of 3-digit LED display is "000"-"100". (For example, displayed "055", it means that the PWM output duty cycle is 55%.) Slow start function: When connect the power to start,the motor will reach the setting speed slowly,not reach immediately.it can avoid the instantaneous impact damage the power or motor. WARNING: Do Not Reverse Positive And Negative Power Loads. This Will Damage The Controller. To Change Motor Direction, Interchange The Positive And Negative Wires of Motor. No forward/reverse function. Note: Transition: 1cm=10mm=0.39inch. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x Motor Speed Controller