PROFESSIONAL QUALITY: This blackout tape is made of high-quality PET material. The specially treated black surface is designed to dim excessive or strong light from various electronic devices. This blackout tape has excellent light blocking, insulation, heat resistance, and UV resistance. (Note: As the tape is very thin, it may curl during use. Please be careful.) Visual adjustment: Blackout tape has excellent light filtering properties and can effectively block the diffusion or spread of light sources while maintaining a certain level of visibility. It not only reduces the irritation of strong light but also always lets you know if your device is on and working properly. Whether the light is strong or weak, the dimming effect can be fully utilized. Perfect for bedrooms, children's rooms, and more. Light control: With this lampshade, you can effectively control the light intensity of various electronic products. It does not completely block the light but provides a dimming effect that allows you to dim the light source. In strong light, it can dim the light intensity by about 50%; in low light, it can block more than 80% of the light. This helps protect your eyes from strong light, prevents eye fatigue caused by strong light, and creates a dark environment for sleeping. Wide range of uses: Semi-blackout film can be used to cover bright digital displays or flashing LED indicators on TVs, alarm clocks, air conditioners, routers, power strips, chargers, and other electronic products, reducing all kinds of annoying glare and infrared interference. It can also be used to cover gaps around cameras and windows that may compromise privacy. In addition, it can be used to seal and secure LED backlight panels, as well as for decoration and creative DIY projects. Package contents: The entire roll of black dimmer tape is 2.5 cm wide and 50 meters long.