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Working Voltage: DC6V-28V(Broad Voltage) Controlling Power: 6V*3A=18W,12V*3A=36W,... Rated Current:3A Speed Rate Range:5%-100% PWM Freguency:21kHz Size:50mm*28mm*17mm Weight:20g Only for Rated or less volatege power. Attention! Do note connect the positive and negative pole reversely. It may break the controller. You could switch motor pole to make it right rotating direction. Adjust he potentiometer to change the motor's speed. Unavailability for DIY children car!!! The power you apply on should not more than the rated current.