This Is a Mobile Phone Video Amplifier or Screen Magnifier.

It functions like a phone projector screen, effectively doubling or enlarging the screen size to 2-4 times the original. It is designed to provide HD vision and eye protection by filtering harmful light and reducing visual fatigue caused by focusing on a small screen for a long time. The design is lightweight, foldable, and portable, making it suitable for travel, camping, or indoor use. It uses HD optical technology and requires no power source.