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Controls the speed of a DC motor through adjusting Pulse-Width-Modulation Suitable for very low voltage ranging from 1.8 to 15V and current no more than 2 amps Over-current protection with a 2-amp fuse---fuse will be blown if there is too much current, and can reconnect automatically after fuse cools The potentiometer is fitted with exterior connection line, but without switch Easy to install and very good quality