【Special Design】Insta360 X4. 【131FT/40M Waterproof】This waterproof housing case with upgraded waterproof sealing ring and tight buckle that help avoid water leakage effectively. You can use your camera to record underwater activity deep to 40 meters/131FT without worrying about leaks, and it also won't damage the shooting effect, clear and vivid. 【Hige Sealing】 The underwater diving protective shell for Insta360 X4 action camera adopts Three-fold buckle design, tighter buckle, not easy to fall off, firmly locked, more secure diving. The shell body is thickened, not easy to deform, High density waterproof ring air tight and no leakage, effectively preventing water from entering the camera. 【0.4" Bigger and 35% Thicker】Stronger than the standard's housing.Large Curved glass Lens:delivers maximum image sharpness above and below water. 【 HD Optical Glass】underwater diving shell for Insta360 X4 is adopts Using optical imaging tempered glass, Lens special optical AR coating treatment, light transmission close to 99.9% can clearly penetrate the shooting picture, the shooting picture is not distorted.