Specifications: It is suitable for the DC motor within 20A. The advantage of using a pulse width modulation (PWM) method for speed regulation is that the energy of the power supply can be fully utilized and the circuit is highly efficient. Using high quality and delicate metal shell, it is safe and convenient to use. Item Name: Motor Speed Controller Material: PCB Working Voltage: 9V-60V Output Voltage: Load Linear Maximum Current: 20A Continuous Current: 18A Speed Adjustment Range: 0%-100% Overload Protection: Yes (Fuse) PWM Frequency: 15KHZ Quiescent Current: 0.01A (Standby State) Speed Regulation Method: Potentiometer (with Switch) Speed Regulation Type: Flow Regulation Features: Speed Controller, 20A, with Switch Size: 85mm x 58mm x 38mm/3.35" x 2.28" x 1.50" (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 Includes: 1 x Motor Speed Controller