This motor speed controller uses fine quality electronic circuit and integrated component for fine durability. Small size, high accuracy, stepless speed regulation, and long service life. It is easy to use, and can be used in conjunction with domestically produced single-phase asynchronous motors to achieve feedback constant speed and stepless speed regulation. You can have a try. Features: The controller uses fine quality electronic circuit and integrated component for durability. It has small size, high accuracy, wide speed controlling range, and long service life. It is easy to use, and can be used in conjunction with domestically produced single-phase asynchronous motors to achieve feedback constant speed and stepless speed regulation. Speed regulation-range is 90-1400r/min 50HZ or 90-1700r/min 60HZ(according to your selection). 400W high power can provides stable performance. Anti-slip rotation knob design for easy adjust the working speed. One button to on/off the motor, and please disconnect the powersupply when it is necessary to stop the operation for a long time. Suitable for packaging, printing, food, electronics, instrumentation, equipment, clothing industry production line for speed control drive devices. Specifications: Name: Speed Controller Motor type: alternating current motor Rated power: 400W Application: motor speed regulator Power supplied: AC110V or AC220V optional, 50/60Hz Environment temperature: -10 celsius to 50 celsius Speed regulation-range: 90-1400r/min 50HZ, 90-1700r/min 60HZ (according to your selection) Item size: 113 * 100 * 60mm / 4.45 * 3.94 * 2.36in Item weight: 252g / 8.89ounce Package size: 120 * 105 * 83mm / 4.72 * 4.13 * 3.27in Package weight: 284g / 10.02ounce Packing List: 1 * Speed Controller 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.