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: SS22Weight: 120g/4.2ozVoltage: 220 VFrequency: 50/60HzRated Current: 5ASpeed Range: 90/1700rpmWorking Environment: -10 ~ 50CSize: Approx. 8 x 5 x 4cm/3.1 x 2 x 1.6inchPackage List:1 x Motor Speed Controller1 x Potentiometer1 x Calibration PlateNote: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.