Cyxus Blue Light Filter [Sleep Better] 9H Premium Tempered Glass Screen Protector for Samsung Galaxy Tab S 8.4 inch (SM-T700/SM-T705) Tempered Glass Screen Protector for Samsung Galaxy Tab S 8.4 inch Filter harmful blue light and UV rays from your device, which can lead to eye-strain and eye-fatigue. Promote healthy melation levels for better sleep. Protect your eyes and your sleep schedule Cyxus adopts American food grade environmental protection material and conforms to the food grade security standard of US FDA and EU security standard. It is non-toxic and innocuous, which really makes mom feel relieved Cyxus can assimilate and transform the electromagnetic wave from mobile phone or tablet PC to prevent human body from radiation injury, especially protection for children and fetus Made of 9H hardness tempered glass, so it is firm enough to prevent scratches, scrape and crack. Protect the screen of your device