DROK PWM DC Motor Controller 6-30V 8A 180W Step less Switch Speed Control Regulator 6V 12V 24V with ON/OFF Switch Occupying Vacancy Proportion Digital Display Panel Meter DROK motor controller working voltage range is DC 6v-30v, rated current is 6A, PWM frequency is 16kHz Potentiometer Knob & LED Display: the speed controller can control motor speed to change from 0 percent to 100 percent by potentiometer knob, and the digital display will show it, convenient to locate speed Equipped Touch Botton: the mtor driver control is with an industrial - grade touch button, you can press it to turn the controller on or off Warm Tips: the digital display is with protective film to protect it from abrasion, dust and static, you can tear it off before using Special Design: the motor is very quiet and has enough torsion when at low speed; small size and low heat