Warm Tips (very Important)Before starting the installation, please double confirm the screen protector is suitable for your screen size.Size:34 inch 21:9: 818*345mmPlease measure the screen without including the border. If there is no size you need, we can customize it for you, just tell me the size you need.Not all blue light is harmful. What is really harmful is short-wave blue light with a wavelength of 420 to 440 or 460 nanometers, which is the most harmful to retina. The blue light between 460 nm and 500 nm has an effect of adjusting biological rhythm, and sleep, mood, memory and so on are all related to it, which is beneficial to human body instead.The anti-blue light factor contained in our anti-blue light film can absorb and filter the harmful blue light with short wavelength, thus preventing the damage of blue light to eyes and skin.Contents : ? (x1) 34 inch Anti Blue Light Screen Protector? (x1) Microfiber cleaning cloth? (x1) Blue light detection lamp