... good tightness, high mechanical strength, to protect your mobile phone 3. dustproof, anti-staining fingerprint, easy cleaning 4. Maximum water ... Grade IPX8 waterproof. 5. Protect your iphone from damge. Immune from saltwater. 6. fit for outdoor , beach pool and so on Photo Show ... used the underwater case . Should put into water for several hours. 3,Pls sure whole case into water, include Safety lock ...