Features: 1. Support 7 to 70V wide voltage input, suitable for a variety of specifications of DC motors, to meet the application requirements of different voltage levels 2. Maximum 30A current output can provide sufficient power for high-power motors to ensure efficient and smooth operation. 3. Optimized circuit design Wide duty cycle adjustment range, smooth motor adjustment without noise and vibration, with power indication, stable circuit design for long time work. 4. Selection of high-quality high-voltage MOS tubes, three 100V high-frequency low-resistance capacitors, standard aluminum shell, to protect the internal circuitry and components for a long time. Parameter: Applicable voltage range: DC7-80V (70V is the highest working voltage application please leave a margin) Driving current: Maximum 30A (high working voltage current is relatively reduced, please use with the power) Control power: recommended 12V 300W, 24V 400W, 48V 450W, 60V 500W. Duty cycle adjustable range: about 1% - 100% PWM frequency: 12KHZ Shell size: 85MM*59mm*34MM Adjustment potentiometer aperture 8MM knob protruding height 16MM Instructions for use and precautions : 1. Please understand the product parameters for the first time. 2. This product is a DC brush motor speed controller, you need to additionally with a DC power supply to the governor power supply can not be connected to the AC power can not drive brushless motors. 3. Before wiring power, please read the wiring label, the input is DC, positive and negative poles can not be connected to the wrong remember Output connected to the motor (motor) does not need to be divided into positive and negative, if the direction of operation is not correct, please switch the two wires of the motor. Package include: DC motor governor *1