Features Soft start can solve the damage caused by instantaneous high current to speed controller. Blocking protection(20A current limited) can limit the high current produced by the blocking of the motor. Ultra-high power control. The maximum current is 20A. It is recommended not to exceed it. Panel switch control makes it more easy to control the speed. With low voltage and stall/over-current protection. Specification: Input voltage: DC 10-60V (The specific voltage must be the same as the rated voltage of the motor) Output voltage: Linear output under load Current: 0-20A (Limited value 20A)                      Regulating type: regulating current Regulating method: potentiometer(270° linear)                                            Regulating speed range: 0-100% Control frequency: 15KHZ Knob: 10K(with switch)                             Size: Approx. 9.6 x 6.1 x 3.4cm / 3.78 x 2.4 x 1.34inch Weight: 107g               Package Included: 1 x DC Motor Speed Controller      Package List