PDA Kobo ZOOM Q2n-4K Compatible Blue Light Cut [Glossy] Protective Film [For
Title PDA Kobo ZOOM Q2n-4K Compatible Blue Light Cut [Glossy] Protective Film [For Display] Made in Japan. ■Significantly reduces blue light! The "blue light" emitted from the LED backlight of the LCD screen is the most stimulating of all visible light rays and is said to have a negative effect on the eyes and body.