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