Features: the motor controller has a soft start function, which can effectively reduce the starting current, protect the motor and prolong the service life of the motor.3 digits led motor speed controller can be adjusted the duty cycle, upper and lower limit duty cycle and working frequency. Good repeatability, high precision, can be quickly adjusted to the desired value. PWM DC motor controller with start and stop button and can be controlled by an external switch, meeting multiple control needs. Maximum power: 360W. Operating voltage: DC5V - 30V, input with reverse protection. Specification: Material: Plastic Size: 79x43x2 6mm/ 3.11x1.69x1.02 inch Working Voltage: DC5V - 30VDC Rated Speed: 12A Max. current: 20A Maximum Power: 360W Working Frequency: 1KHz - 99KHz adjustable, step 1KHz, default frequency 20KHz, You can mention them: 1%Package Included: 1x DC Motor Driver Note: please allow 1-3cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.