Specifications: It features 12-48V wide voltage 60A. The input voltage must be positive and negative. Can not input 220V household electricity. The input voltage should be equal to the rated voltage of the motor (within 12-48V). The digital display only displays 0-100 as the percentage of the motors full speed, not the actual motor speed. Item Name: DC Motor Speed Controller Material: PCB Working Voltage: 12V-48V Output Voltage: Linear under Load Maximum Current: 100A Continuous Current: 60A Speed Adjustment Range: 0%-100% Control Frequency: 15KHZ Speed Regulation Method: Potentiometer (with Switch) Speed Regulation Type: Flow Regulation Forward and Reverse: Support Digital Display Positioning: 0-100 (Percentage of Full Speed) Features: Durable, Useful, Easy to Install Main Board Size: 12.8cm x 9.8cm x 4cm/5.04" x 3.85" x 1.57" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included: 1 x DC Motor Speed Controller