Features: 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, medical equipment, clothing industry production line for speed drive device. Connect COM and CW, the motor rotates in forward direction; connect COM and CCW, the motor rotates in reverse direction. Specification: Model: UX-52 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*10cm/3.9*3.9inch Weight: Approx. 322g / 11.4oz Package List: 1 x Motor Speed Controller . Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.