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Features: CCMHCW DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-Width-Modulated (PWM). Adjustable speed range is 5%-100%. Incorporate a 10A fuse, and with the protection function of reverse connect power supply. Suitable for the DC motor (or DC load) within 8A, Peak current 10A. potentiometer cable length 20cm. Operating instruction: Before you attempting to wire the controller, make sure power is off. WARNING: TO CHANGE MOTOR DIRECTION, INTERCHANGE THE POSITIVE AND NEGATIVE WIRES OF MOTOR. 1. Connect wires refer to the "wiring diagram" (NO.4 picture). 2. Turn on the power, and adjust the potentiometer. Package Including: 1 x DC Motor Speed Controller