<b>What is Blu-light?</b><br> Blue light refers to light with a wavelength of 380-495 nm and it's a kind of visible light. Blue light is short and has high energy. It can penetrate the lens directly to the retina of the fundus. Bluelight is widely used in LED light sourced products such as PCs, Cell Phones, Tablets, Game machines and TVs. However, mobile phone screens, LEDs, and computer screen lights all generate a lot of blue light. This can cause harm to people's eyes and skins, and cause eye fatigue and may even cause age-related macular degeneration which not only resulting in visual fatigue, but also not conducive to normal sleep.<br><br> <b>Why You need to buy the Anti Blue Light Screen Protector?</b><br><br> <b>Anti-Blue Light Filter Features:</b><br> 1.Filter out Blue Light<br> 2.UV400 protection<br> 3.Relieve the fatigue of eyes<br> 4.Radiation Protection: Through the absorption and conversion of ultraviolet rays, it prevents the dry skin caused by UV reflections from causing skin pigmentation, chloasma and other problems<br> 5.Anti-fingerprint, Scratch Resistant(9H), HD Retina Clarity<br> 6.Anti-static screen protector<br><br> <b>Package Included:</b><br> - 1 x Anti-Blue Light Screen Protector for Surface Book 1/2 13.5" Laptop<br> - 1 x Keyboard Cover for Surface Book 1/2 13.5" Laptop<br> - 1 x Microfiber Cloth<br> - 1 x Wet Cleaner<br> - 1 x Dust Remover sticker<br><br> <b>How To Apply:</b><br> 1.Check the filter dimension is suitable for your screen<br> 2.Clean your laptop screen with the microfiber cloth<br> 3.Remove the fine dust with dust removal sticker<br> 4.Peel off a little of the backside of Tab 1 gently before applying to the screen<br> 5.Align the filter starting at the top, slowly peel off Tab 1 and squeeze the bubbles out with card<br> 6.Peel off Tab 2 when finished<br>