Feature: 1. Better Control: By adjusting the pulse width modulation, that is PWM, the regulator can easily control the motor speed. 2. Simple Working: The PWM frequency is 21kHz, and the duty cycle can be adjusted from 0% to 100%, reliable and convenient. 3. Reliable Using: Also comes with switch potentiometer to control the CW rotation, CCW rotation and stop of the DC motor. 4. Easier Viewing: 3 digit LED display screen enables a clear viewing on the output, making the operation much simpler. 5. Easy to Install: Designed to have a light weight as well as 57 x 37 x 21mm compact size, the installation is very easy. Specification: Item Type: Motor Speed Controller Input Power Voltage: 6V - 24V DC PWM Frequency: 21kHz Adjustable Duty Cycle: 0%-100% Rated Current: 30A Potentiometer: With switch function. Digital Display: The display range of 3 digit LED display is 000-100. For example, 055 is displayed to indicate that the PWM output duty cycle is 55%. Product Size: Approx. 57 x 37 x 21mm / 2.24 x 1.46 x 0.83in. Package List: 1 x Motor Speed Controller