1,High‑performance DC motor speed controller, no harsh whistle, very practically. 2,The product uses enough materials, high power, low heat, high efficiency and large torsion. 3,Use high‑grade sealed potentiometer with switch function, and with CW and CCW control. 4,Product with stepless speed regulation, CW/CCW switch, simple operation. 5,With power supply reverse connection, control voltage overvoltage, high current protection. Item Type: Motor Speed Control Module Technical Parameter: Model: CCM2NJ Potentiometer: Resistance Value: B100K; Hole Opening: Approx. 8mm / 0.3in Control Power: 12V x 3A=36W, 24V x 3A=72W......40V x 3A=120W Rated Current: 3A Maximum Current: 5A Speed Adjustment Range: 10%‑ PWM Frequency: 15kHz Applicable Current: Rated Current: 3A Power Range: Maximum 120W Speed Adjustment Range: 10%‑ Size: Approx. 73 x 40 x 31mm / 2.9 x 1.6 x 1.2in 1 x Motor Speed Control Module Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.