This motor speed controller is compatible with AC220V 50/60H motors. The speed range is 90-1400 r/min for 50H and 90-1700 r/min for 60H. It is easy to operate, even for beginners to learn and master quickly. The black wire is the main wire connecting the motor speed controller; the red and white wires are auxiliary wires connecting the capacitor; the two blue wires are the speed feedback wires; and the green wire is the ground wire. The motor control unit uses high-quality electronic circuitry and integrated components, ensuring a long service life. The threaded knob with a potentiometer facilitates rotation and stepless speed adjustment. The motor control unit is compact, highly precise, has a wide speed range, and a long service life. It offers high precision in fine-tuning motor speed. This motor speed controller is compatible with production line speed control applications in industries such as packaging, printing, food, electronics, instrumentation, medical equipment, and apparel. Specifications: Power Supply: AC220V 50/60Hz Rated Power: 400W Ambient Temperature: -10邃 Relative Humidity: <90% Speed 窶銀€騎ange: 90-1400 rpm 50Hz, 90-1700 rpm 60Hz Weight: 295g Package Contents: 1 x Speed 窶銀€気ontroller