Features: The controller uses fine 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 90-1700r/min 60HZ. 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: Motor type: alternating current motor Rated power: 400W Application: motor speed regulator Power supplied: 220VAC, 50/60Hz Environment temperature: -10 to 50 Speed regulation-range: 90-1700r/min 60HZ