Insta360 GO 2 Lens Guard Screw-on replaceable lens protector. Designed with hardened glass and an anti-fogging protective coating. How to Replace the Lens Guard Twist the Lens Guard counterclockwise to remove it. Twist the Lens Guard clockwise to secure onto the lens. Important notes 1) Before use make sure that the Lens Guards rubber ring and the cameras lens is clean and dry. Always install the Lens Guard in a clean and dry environment. Any particles on the lens or Lens Guard may affect the shooting results. 2) Before use underwater make sure to install GO 2s Lens Guard. Without the Lens Guard installed GO 2 is not waterproof. Screw on the Lens Guard tightly to prevent image quality issues.