Features: 1. The invisible dive case for Insta360 X4 Air, completely invisible design that allows full 360° underwater shots, Ideal for diving, surfing, snorkeling and other water sports activities. When diving you have to use two of the fog protectors on each side 2. Use Insta 360 X4 Air invisible waterproof housing case, very good sealing performance, water resistant to 50m. you can take your camera up to 164ft (50m) deeper underwater. Seamless underwater stitching 3. Underwater diving shell for Insta360 X4 Air is adopts using lens material is PMMA., the light transmittance of the lens is more than 98%, the surface of the lens is smooth and flat, and the shooting picture is not distorted, can shoot clear 360° videos for you .