Features:Incorporate a 30A fuse, and with the protection function of reverse connect power supplyHigh Power, Digital DisplayPotentiometer with switch functionLarge 0.56 inch 3-digit LED display numbers allow viewing under the most adverse conditionsThe display range of 3-digit LED display is "000"-"100". (For example, displayed "055", it means that the PWM output duty cycle is 55 percent .)Specifications:Model: CCM6DS-DPWM frequency: 21kHzDuty Cycle adjustable: 0 percent -100 percent Suitable current range:current rating: 30AModule Size(with case): 110 x 77 x 35mmDisplay device: 79 x 42 x 24mmPotentiometer cable length: 0.79inchPackage Including:1 x Digital Display CCM6DS-D DC Motor Speed Controller With CaseNote: -Do Not Reverse Positive And Negative Power Loads. This Will Damage The Controller. To Change Motor Direction, Interchange The Positive And Negative Wires of Motor.-Before you attempting to wire the controller, make sure power is off..