Features:Made with high quality circuit board which ensures a longer service life.Equipped with fuse tube to protect the speed controller from burning out that short circuit causes.Controls the speed of a DC motor with this controller High efficiency, high torque and low heat generation.With reverse polarity protection, high current protection Operating.Adjusting the potentiometer knob changes the governor output duty cycle and the motor speed changes.Specification:Item Type: PWM Motor Speed Control SwitchMaterial: Electronic ComponentsOutput current: 0-5AOutput power: 90W (maximum)Quiescent current: 7uA (standby state)PWM duty cycle: 1 percent -100 percent PWM frequency: 20khzWeight: Approx. 16gPackage list:1 x Motor Speed Controller SwitchNotes:Do not reverse the positive and negative terminals of the DC power supply, otherwise the governor may be damaged.The motor can be positive or negative. When the running direction is inconsistent with the expectation, the direction can be changed by adjusting the line sequence.Adjusting the potentiometer knob changes the governor output duty cycle and the motor speed changes..