This motor speed controller is suitable for AC 220/240V 50/60Hz motor. The speed regulation range is 90-1400r/min 50Hz, 90-1700r/min 60Hz. Suitable for packaging, printing, food, electronics, appliances, clothing industry production line speed regulation drive device. The controller uses electronic circuit and integrated components to ensure durability. It has small size, high precision, wide speed regulation range and long service life. Usage: 1. Turn off the power, connect it according to the wiring and make the connection. 2. Fix the controller well and set the speed to the lowest "0" to avoid sudden current and constant when starting the power. 3. Then turn on the power and set the speed knob to the position. Turn off the power when not needed. 4. The controller is connected to the motor. If it is found that either speed does not meet the requirements, adjust the fine adjustment potentiometer on the side of the product. 5. To change the running direction of the motor, simply swap the "CCW" and "CW" jumper lines on the back of the controller. 6. Select and CW short connections, then the motor will rotate clockwise. 7. Select and CCW short connection, then the motor will rotate counterclockwise. Color: Black Material: ABS Package Contents: 1 x Motor Speed Controller Only the above package contents, other products are not included. Note: Due to the light and different displays, the color of the item may be slightly different from the actual item. The measurement allowed error is +/- 1-3cm.