Suitable for AC 220/240V 50/60HZ motors. Speed regulation range: 90-1400r/min (50Hz), 90-1700r/min (60Hz). Ideal for packaging, printing, food, electronics, instrumentation, and clothing industry production lines as a speed control drive device. Uses durable electronic circuits and integrated components for long service life. Features small size, high precision, and wide speed controlling range. How to use: 1. Turn off power before wiring; ensure correct connections. 2. Fix the controller and set speed to lowest "0" to avoid sudden current damage when starting. 3. Turn on power and adjust knob to desired speed; turn off when not in use. 4. Connect to motor; adjust side potentiometer if torque/speed is inconsistent. 5. Change motor direction by replacing "CCW" and "" jumper lines on the back. 6. Short COM and for clockwise rotation; short COM and CCW for counterclockwise. Color: As shown in the picture. Material: ABS. Package Contents: 1 x Motor Speed Controller. (Only the above items included; other products not included.) Note: Light and different displays may cause slight color variation from the picture.