Color: black Material: ABS,Plastic,metal Size: 5 * 3.2 * 1.5cm. The 1203BB DC Motor Speed Regulator controls the speed of a DC motor by adjusting -Width-Modulated (PWM). It provides a continuous current of 3A to your DC motor or other DC load. Besides, the circuit also includes a 3A fuse, with reverse connection of power supply and control the or reverse direction and the stop of DC motor by switch. The input power range is DC6-28V. Control the or reverse direction and the stop of DC motor by switch. Potentiometer with switch function. The switch cable length 15cm. Operating instruction you attempting to wire the controller, make the power is off. 1. Connect refer to the wiring . 2. Turn on the power, and adjust the potentiometer. 3. The LED indicates the power up and the speed of motor. Warning: Do not reverse and negative power loads. This will damage the controller! Contents: 1 * 1203BB 6V 12V 24V 3A 80W DC Motor Speed Controller (PWM) Adjustable Reversible Motor Driver Switch Only the above content, other are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.