The PWM controller needs to be loaded with kit in order to paintings correctly Please do not verify without load DC motor velocity regulator 12V24V36V48V High strength force module PWM controller 20A latest regulator for management motor speed Working voltage:9V~60V Output voltage:Linear beneath load Maximum current:20A Continuous current:18A Speed control range:0%——100% Overload protection: SEFUSE Speed control mode:Use potentiometer regulating recent Modular size:76mm*44mm*26mm Product weight:70g