Speed Control Knob: This knob can adjust motor speed and display in real time.There are 5 controllers in different and you can choose 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, 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-52Input Voltage: AC 220V 50HzOptional : 15W, 60W, 120W, 250W, 400WOutput Speed: 0-1450rpmSpeed Adjustable Range: 0-1450rpmOperation Mode: Manual PrecisionSpeed Change Rate: less than or equal to 2%Steady Speed Precision: 10Port: PinSize: Approx. 10 x 10cm/3.9 x 3.9inchWeight: Approx. 322g / 11.4ozColour: BlackMaterial: ABSPackage Contents:1 x Motor Speed ControllerOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.