A. The waterproof case is crafted using a 1:1 mold with a real machine, ensuring a perfect fit for the camera. Video recording shows no vignetting. The lens is made of tempered glass, featuring high hardness and good light transmittance, which helps prevent scratches and provides effective protection for the lens. B. All metal fittings of the waterproof shell are constructed from 316 stainless steel, offering good resistance to seawater corrosion. The waterproof case has a water resistance rating of 45M, making it suitable for use at the beach or during diving activities. C. The matching aircraft screws are designed based on human mechanics, allowing for labor-saving use. They can securely fix the waterproof shell without loosening. D. Applicable models: Only compatible with GoPro Hero 7 Silver & White Action Camera. Note: The camera is not included in the sales package.