1,Incorporate a 30A fuse, and with the protection function of reverse connect power supply 2,High Power, Digital Display 3,Potentiometer with switch function 4,Large 0.56 inch 3-digit LED display numbers allow viewing under the most adverse conditions 5,The display range of 3-digit LED display is "000"-"100". (For example, displayed "055", it means that the PWM output duty cycle is 55%.) Features: Incorporate a 30A fuse, and with the protection function of reverse connect power supply High Power, Digital Display Potentiometer with switch function Large 0.56 inch 3-digit LED display numbers allow viewing under the most adverse conditions The display range of 3-digit LED display is "000"-"100". (For example, displayed "055", it means that the PWM output duty cycle is 55%.) Specifications: Model: CCM6DS-D PWM frequency: 21kHz Duty Cycle adjustable: 0%- Suitable current range:current rating: 30A Module Size(with case): 110 x 77 x 35mm Display device: 79 x 42 x 24mm Potentiometer cable length: 0.79inch Package Including: 1 x Digital Display CCM6DS-D DC Motor Speed Controller With Case Note: -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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.