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Features: ZS-X4A Mini Style DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-Width-Modulated (PWM). Super Mini style item with the latest low voltage technology. Adjustable speed range is 1%-100%. Incorporate a 30V 2.5A fuse, and with the protection function of reverse connect power supply. It is not only to use for dc motor controls of the speed,but also to use for adjust the LED light. 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 Mini PWM DC Motor Speed Controller Led Dimmer