The 1203BB DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-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 supply and control the forward or reverse direction and the stop of DC motor by switch.The input range is DC6-28V.Control the forward or reverse direction and the stop of DC motor by switch.Potentiometer with switch function.The switch cable length 15cm.Operating instructionBefore you attempting to wire the controller, make that the is off.1. Connect wires refer to the wiring diagram.2. Turn on the , and adjust the potentiometer.3. The LED indicates the up and the speed of motor.Colour:blackMaterial:ABSSize:5 x 3.2 x 1.5cmPackage Contents:2 x Motor Speed ControllerWarning: Do not reverse positive and negative loads. This will damage the controller Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.