Feature:PWM DC motor speed controller is a very safe product.When the situation is overcurrent, it will disconnect by itself. after cooling off a few seconds, the fuse will recovery automatically.With high voltage and high current resettable fuseMini but usefulSpecification:Operating voltage: DC 5-30VControl power: 90W (maximum)Quiescent current: 0.015A (standby)PWM duty cycle: 1% -100%PWM frequency: 10khzSize: 29mm*23mm (excluding handles)Total height: 15mmKnob color: Send randomlyPackage included:3 x PWM DC motor speed controller