1Quiet and Stable: The motor speed controller runs smoothly without noise and vibration,and the circuit design is stable. 2Long Time Working: This motor speed controller is optimized for the circuit, so that the motor has a wider adjustment range and can work continuously. 3Complete Functions: The motor speed controller has wide voltage, large current design, current peak value up to 30A, with running, stopping and braking functions. 4Imported Materials: The motor speed controller imported high voltage MOS tubes, equipped with fuses and aluminum alloy shells, which can ensure the internal circuits and components for long term durability. 5Wide Voltage Range: The motor speed controller can be applied to the voltage of DC 770V, and has a wide range of uses. Item Type: Motor Speed Controller Material: Aluminum Alloy Applicable Voltage Range: DC 7-70V (70V is the highest working voltage, please leave a margin) Driving Current: The maximum peak value is 30A (the working voltage and high current should be relatively reduced, please use it with the power) Control Power (Recommended): Within 12V 250W Within 24V 300W Within 36V 360W Within 48V 400W Duty Cycle Adjustable Range: About 1 percent -100 percent PWM Frequency: 12KHZ Shell Size: Approx. 85 x 60 x 34mm or 3.3 x 2.4 x 1.3in 1 x Motor Speed Controller Have a great time shopping!