[Wide Voltage]: Wide voltage input 7-70V, maximum output current 30A (Please refer to the recommended power range for actual use current. It is recommended 12V within 250W, 24V within 350W, 48V within 450W, and 60V within 500W. )[Speed Control Knob]: The knob has a switch function, which can control the motor speed from 0% to 100%. Adjustable potentiometer flexible cable can be separated, the cable length is 15CM.[30A Fuse]: This set contains a 30A fuse to prevent shorting of the motor interface. Double protection of your Motor and Motor Speed Controller.[Note 1]: The power of the input power supply must be 1.5 the rated power of the motor to make the motor work (note: the input voltage and the rated voltage of the motor must be ).[Note 2]: If there is a -reverse circuit regulator on the children's car, please be to connect the speed controller between the power supply and the -reverse circuit regulator of the children's car. Otherwise, the speed controller may be damaged.Precautions:The module is a DC motor speed controller and cannot be connected to AC power.The power of the input power supply must be 1.5 the rated power of the motor to make the motor work (note: the input voltage and the rated voltage of the motor must be ).Modification for Children's CarIf the product is used in the modification of children's car, the output end of the speed controller can be connected with a and Reverse Switch to realize the function of and reverse control.If there is a and reverse circuit regulator on the children's car, please be to connect the speed controller in front of the and reverse circuit regulator (In other words: between the power supply and the and reverse circuit regulator) of the children's car. Otherwise, the speed controller may be damaged.Specification:DC Motor Speed ControllerApplicable voltage range: DC 7-70VDrive current: max. 30A (Please refer to the following "Control power (recommended)" for actual use current)Control power (recommended):12V: within 250W24V: within 350W48V: within 450W60V: within 500WDuty adjustable range: about 1% -100%PWM frequency: 12KHzFuse:Current: 30A maxWire diameter: 2.5mm2 / 0.4cm diameter / 12AWGLength of wire: 26cm ( length including 30cm)Material:ABScolour:As ShownPackage Contents:1 x DC Motor Speed ControllerOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.