Anti-blue light filter.Approved by SGS,blocking out up to 49% of harmful blue light,relieving computer eyestrain. 9H hardness glass and 0.33mm thick premium tempered glass.Protecting iPhone from cuts and scratches. Rounded edges for full coverage.Compatible with most cases. Hydrophobic and stain-resistant.Oleophobic screen coating againsts sweat and oil residue or makeup. Bubble free and anti-fingerprint.Takes just seconds to apply.