Features The motor speed controller supports soft start and soft shutdown, which reduces mechanical stress on the motor and shaft. 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 below 350W and 48V motors with power less than 500W. Designed with digital display panel for easy reading and convenient speed adjustment The input of the DC motor controller is connected to direct current, can not be connected to alternating current, otherwise it will be burned. Description: This is a simple and easy to use DC motor speed controller, small in size, elegant appearance and stable performance. It is made with high quality PCB which ensures a longer service life. The input voltage can be 12V DC to 80V and the output voltage is 0-100% of the input voltage. This speed controller supports soft start and soft shutdown, which is quite convenient to adjust. Features: Input voltage: DC 12V-80V. Output voltage: 0-100% of 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: 21kHzController Size: 110 x 77 x 36mm/4.37 x 3.03 x 1.41" Panel Size: 92 x 69 x x 13mm/3.62 x 2.71 x 0.51" Package includes: 1 x Speed Controller Package List