Feature:1. Quiet and Stable: The motor speed controller runs smoothly without noise and vibration,and the circuit design is stable.2. Long Time Working: This motor speed controller is optimized for the circuit, so that the motor has a wider adjustment range and can work continuously.3. Complete Functions: The motor speed controller has wide voltage, large current design, current peak value up to 30A, with running, stopping and braking functions.4. Imported 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.5. Wide Voltage Range: The motor speed controller can be applied to the voltage of DC 770V, and has a wide range of uses.Specification:Item Type: Motor Speed ControllerMaterial: Aluminum AlloyControl Power (Recommended):Within 12V 250WWithin 24V 300WWithin 36V 360WWithin 48V 400WDuty Cycle Adjustable Range: About 1%-100%PWM Frequency: 12KHZShell Size: Approx. 85 x 60 x 34mm / 3.3 x 2.4 x 1.3in.Package List:1 x Motor Speed ControllerNote:1. This product is a DC brush motor speed controller. It needs to be equipped with a DC power supply to supply power to the speed controller. It cannot be connected to AC power and cannot drive a brushless motor.2. Please read the wiring label clearly before the wiring is powered on. The input is DC, and the positive and negative poles cannot be mistaken! The output connection to the motor does not need to be positive or negative. If the running direction is wrong, please exchange the two wires of the motor.