Description: This is a simple and easy-to-use DC motor speed controller of small size, elegant appearance and stable performance. It is made with high quality circuit board which ensures a longer service life. The input voltage can be DC 12V to 80V and output voltage is 0-100% of the input voltage. This speed controller support soft start and soft stop, which is quite convenient to set. 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-80V Output Voltage: 0-100% of the input voltage Maximum Current: 30A Control Power: 12V 250W or less, 24V 350W or less, 48V 500W or less Speed range: 0~100% PWM frequency: 21kHz Controller 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