Description: Speed Control Knob: This knob can adjust motor speed and display in real time. There are 5 controllers in different power and you can choose the one you need. It has compact size, high precision, wide speed controlling range, and long service life. Built-in capacitor, supporting CW/CCW rotation. Widely used in packaging, printing, food, electronics, instruments, medicals equipment, clothing industry production line for speed drive device. 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 Speed Change Rate: ≤2% Steady Speed Precision: 10 Size Chart: 10x10cm/3.94x3.94inch Package Includes: 1 piece Motor Speed Controller Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!