This motor speed controller uses electronic circuit and integrated component. Small size, high accuracy, stepless speed regulation, and long service life. It can be used in conjunction with domestically produced single-phase asynchronous motors to achieve feedback constant speed and stepless speed regulation. (according to your selection). 400W power can provides stable performance. Anti-slip rotation knob design for 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 to 50 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