The 1203BB DC motor speed controller controls the speed of a DC motor by adjusting pulse width modulation (PWM). It provides a continuous current of 3A to your DC motor or other DC load. Additionally, the circuit includes a 3A fuse, with reverse connection of the power supply and control of the DC motor's forward or reverse direction and stop with a switch. The input range is DC6-28V. Controls the DC motor's forward or reverse direction and stop with a switch. Potentiometer with switch function. The length of the switch cable is 15 cm. User Manual Before attempting to wire the controller, make sure it is turned off. 1. Connect the wires according to the wiring diagram. 2. Turn on and adjust the potentiometer. 3. The LED indicates startup and the motor speed. Color: Black Material: ABS Size: 5 x 3.2 x 1.5 cm Package Contents: 1 * Motor Speed Controller Warning: Do not reverse positive and negative loads. This will damage the controller. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real one. The allowed measurement error is +/- 1-3 cm.