Features Motor speed controller support soft start and soft stop, which reduces the mechanical stress on the motor and shaft Designed with a digital display panel for easy reading and convenient setting of speed adjustment DC motor controller input is connected to direct current, can not be connected to alternating current, or it will be burnt Make sure the positive and negative polarity is connected correctly, otherwise the controller will be damaged Suitable for 12V motors with power less than 50W, 24V motors with power less than 350W, and 48V motors with power less than 500W Specifications:Input Voltage: DC 12V-80VOutput Voltage: 0-100% of the input voltageMaximum Current: 30AControl Power: 12V 250W or less, 24V 350W or less, 48V 500W or lessSpeed range: 0~100%PWM frequency: 21kHzController Size: 110 x 77 x 36mm / 4.37 x 3.03 x 1.41" Panel Size: 92 x 69x x13mm / 3.62 x 2.71 x 0.51"Instruction:Set 1: "000"-"100", Slow start to 100% speed time is adjustable between 0-10.0 seconds, the default is 1 second.Set 2: "000"-"100", Slow stop time is adjustable between 0-10.0 seconds, the default is 1 second.Set 3: "000"-"080", The minimum speed is adjustable from 0 to 80%, and is less than the maximum speed setting value, the default is 0.Set 4: "000"-"100", The maximum speed is adjustable between 0-100%, and is greater than the minimum speed setting value, the default is 100%.Set 5: "000", "002" , "005" , "010" , "015", "020" , "025", The speed changes by 1%, 2%, 5%, 10%, 15%, 20%, 25% each time you press the up or down button. Package Includes:1 x Speed Controller Package List