This Tempered Glass Protect Your Eyes from Anti Blue Light. This tempered glass acts as sun glasses for your mobile, you can see screen even in bright sun Major Advantages -Design for your Eyes' Health. Anti-Blue Light Filter Tempered Glass Screen Protector prevent your Eye Retina from eye fatigue causing by Blue Ray from cellphone screen. Assist you to have a better sleep since it could soften screen's light and comfort your eyes. -Ultra Transparent, 2.5D Round Edges.Touch Screen Accuracy,Delicate Touch -High Hardness(9H),Impact Resistance. Anti-shatter Glass, Won't be sharp even broken.Safer! - Ultra Thin Glass will give mobile screen sensation to fingers Steps Step 1 -Clean screen with Wet Wipe; -Dry and remove streaks with Dry Wipe. Step 2 -Peel off Protective Mask from Protector, -Be sure NOT touch the "Sticky Silicone" side of protector. Step 3 -Align the cutouts correctly, then Place the protector on screen, -Then Press & Hold your index finger (about 10 seconds) on the center of screen to complete Silicone Adhesion. -Squeeze out air bubbles starting from the center of screen and wide outwards. -Bubble on the edges will disappear within 1 to 2 days.