Speed Control Knob: This knob allows for motor speed adjustment with real-time display. Includes 5 power options, allowing you to select the appropriate controller for your needs. Features compact design, high precision, wide speed control range, and long service life. Built-in capacitor supports CW/CCW rotation. Commonly used in packaging, printing, food processing, electronics, instruments, and textile industry production lines as a speed drive device. Connect COM and CW for forward motor rotation; connect COM and CCW for reverse rotation. Specification: Model: UX-52 Input Voltage: AC 220V 50Hz Optional Power: 15W, 60W, 120W, 250W, 400W Output Speed: 0-1450rpm Speed Adjustable Range: 0-1450rpm Operation Mode: Manual Precision Speed Change Rate: 2% Steady Speed Precision: 10 Port: Pin Size: Approx. 10 x 10cm / 3.9 x 3.9in Weight: Approx. 322g / 11.4oz Color: Black Material: ABS Package Contents: 1 x Motor Speed Controller Note: Other items not included. Lighting and display differences may cause slight color variations between image and actual item. Measurement error allowed is +/- 1-3cm.