Specification:Input Voltage: DC 9-60VOutput Voltage: LinearOutput Current: 0-20AContinuous Rating: 1200WSpeed Regulation Type: Current RegulateSpeed Regulation Mode: Potentiometer (linear)Speed Regulation Rage: 0-100%Control Frequency: 25KhzSize: approx. 92 x 52 x 36 mm/3.62 x 2.05 x 1.42"Install Size:Center Distance: approx. 104 mm/4.09"Potentiometer Hole Diameter: approx. 7 mm/0.28"Package included:3 x DC motor speed regulator