If the lens hole does not light up when the mouse is turned on, please refer to the following details:
1. The Xiaomi Wireless Mouse Comfort Edition adopts an infrared tracking engine, which improves positioning accuracy and adapts to more table surfaces. Infrared tracking provides better precision and higher DPI (dots per inch) ranges, enabling accurate cursor movement even with small hand motions;
2. At the same time, the infrared light is just barely visible, and only weak red light can be seen through the bottom lens hole. It is normal and please feel free to use it in this regard.