Features This AC motor speed controller is designed with small size, precision, wide rang of speed regulation and low power consumption. With speed control knob can adjust motor speed and be displayed in real time. Built-in capacitor, convenient to use. Easy installation, superior performance, easy maintenance. Widely used in packaging, printing, food, electronics, instruments, medical equipment, clothing industry production line for speed drive device. Features: This AC motor speed controller is designed with small size, precision, wide rang of speed regulation and low power consumption.With speed control knob can adjust motor speed and be displayed in real time.Built-in capacitor, convenient to use.Easy installation, superior performance, easy maintenance.Widely used in packaging, printing, food, electronics, instruments, medical equipment, clothing industry production line for speed drive device. Specification: Material: Plastic  Model: SS-22 Weight: 120g/4.2oz Voltage: 220 V Frequency: 50/60Hz Rated Current: 5A Speed Range: 90/1700rpm Working Environment: -10 ~ 50°C Size: Approx. 8 x 5 x 4cm/3.1 x 2 x 1.6inch Package List: 1 x Motor Speed Controller 1 x Potentiometer 1 x Calibration Plate Note: 1. Please allow 1-2cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3. 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. Package List