Cyxus Blue Light UV Filter [Sleep Better] [Anti Eye Strain] Premium Tempered Glass 9H Hardness Film Screen Protector for Microsoft Surface Pro 4 (Scratch Proof) Blue Light Blocking Tempered Glass Screen Protector for Microsoft Surface Pro 4 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 Made of real Premium 9H hardness tempered glass with 2.5D rounded edge, so it is firm enough to prevent scratches, scrape and crack. Protect your screen from scratches to high impact drops. High Definition Transparency Film that ensures maximum resolution for Display. TruTouch Sensitivity for a natural feel that provides flawless touch screen accuracy Easy to Install with self-adhesive silicone and bubbles-free/no Residue