Functionality: 1. Equipped with on-off button and external switch control to meet customer's various control requirements. 2. Motor soft start function. When the motor starts, the current increases slowly and there is no inrush current, which can effectively protect the motor and prolong the service life. 3. The duty cycle, upper and lower duty cycle and operating frequency can be set to allow the customer to run and use their motor according to their operating characteristics. 4. The digital encoder knob adjusts the motor speed, which is more precise and consistent than ordinary potentiometers. Specification: Item Type: Motor Controller Operating voltage: DC5V~30V, input anti-reverse protection Rated current: 5A, maximum current 15A Maximum power: 150W Working frequency: 1KHz ~ 99KHz adjustable, 1KHz step, default frequency 20KHz, accuracy about 1% Duty cycle: 0-100%, 1% step Product size: 79 x 43 x 26mm / 3.11 x 1.69 x 1.02in All adjustable parameters are power off. List of packages: 1 x module Note: Digital encoder button operation In default interface: (default display duty cycle) Short press - switch motor start and stop Long press - enter interface settings < p>Rotate antih rotation - reduced duty cycle Turn clockwise - increased duty cycle