This motor speed controller uses fine quality electronic circuit and integrated components 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. The controller uses fine quality electronic circuit and integrated components for durability It has a 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 provide stable performance Anti-slip rotation knob design for easily adjusting the working speed One button to on/off the motor, and please disconnect the power supply when it is necessary to stop the operation for a long time Suitable for packaging, printing, food, electronics, instrumentation, equipment, and 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