Description: 【Premium Material】: The Motor Speed Controller is made from premium PP, ensuring wear resistance, durability, and long term use. 【Advanced Technology】: The Intelligent Motor Speed Controller uses single chip digital control technology for multifunctional design, accurate speed controlling, and stable performance. 【User friendly Interface】: It features a digital display menu for convenient and quick modification of settings. The display rate can be set according to user needs, with automatic conversion. 【Versatile Control】: This device allows for slow increasing speed and deceleration, controllable via the panel operation or external switch. The panel knob automatically matches the highest speed for easy and safe adjustment. 【Protective Features】: The Motor Speed Controller comes with a blockage protection function to prevent motor and speed controller damage due to blockage, ensuring long term use. Specification: Voltages: and 220V Motor output: 400W Speed range: 90-1400r/min Size Chart: 9cmx10cmx6cm/3.54inchx3.94inchx2.36inch Package Includes: 1 Motor Speed Controller Note: Please allow slightly errors 1-2cm differences due to manual measurement.