Features 1. Mold-made for the Insta360 X4 Air action camera; 2. High-transmittance, scratch-resistant lens: The lens material is PMMA with 95% light transmittance. After coating with AR anti-reflective film, the light transmittance reaches 98%. Additional anti-fog and anti-drip coatings ensure maximum light transmittance during shooting. AS waterproof and fingerprint-resistant film, AS hardened film, surface hardness 5H, comparable to ordinary glass, scratch-resistant; 3. Protective shell: The shell is made of hardened PC with 10-grit internal and external reinforcement, making the product scratch-resistant, textured, and fingerprint-resistant; 4. Fully invisible structure protection: 360-degree fully invisible, eliminating all blind spots; unique optical spherical lens design, underwater panoramic stitching, can restore seamless panoramic images; 5. Professional waterproof performance: 50-meter full-body underwater waterproof design, using liquid silicone technology to enhance waterproof function, ideal for diving, snorkeling, swimming and other water sports; 6. Waterproof ring material: Amorphous high-activity silicone; 7. Main body and back cover connecting shaft material: High-hardness 316 stainless steel; 8. Button material: 316 stainless steel Package List 1. Waterproof case x 1 2. Long screw x 1 3. Invisible adapter x 1 4. Storage bag x 1 5. Alcohol bag x 3 packs (6 pieces in total) 6. Anti-fog sheet x 4 packs (24 pieces in total)