1803BK DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-Width-Modulated (PWM).The input power range is DC 1.8-15V .Use a 2A resettable fuse to protect the controller.Potentiometer with switch function.Operating instruction: you attempting to wire the controller, make power is off.WARNING: TO CHANGE MOTOR DIRECTION, INTERCHANGE THE POSITIVE AND NEGATIVE WIRES OF MOTOR.Connect wires refer to the "wiring " (NO.5 picture).Turn on the power, and adjust the potentiometer.The LED indicates the power up and the speed of motor.Input supply voltage: 1.8V-15VDC;The maximum output power: 30WThe maximum continuous output current: 2ADuty adjustable: 0%-100%Material: PlasticColour: GreenItem size: 1.3 x 1.3 x 0.6 inches; Net Weight: 0.5 ouncesPackage Contents:1 x DC Motor Speed ControllerOnly the above package content, other products are not included.Note: Light 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.