1. Shell material: Hardened PC with 10 fine lines on the inside and outside, making the product scratch resistant, textured, anti flower and fingerprint resistant 2. Lens material: PMMA, with a transmittance of 95 percent . After coating with AR antireflective film, the transmittance can reach 98 percent 3. AS waterproof and fingerprint proof film, with AS added hard film, with a surface hardness of 5H, comparable to ordinary glass hardness, anti scratch and scratch resistant, achieving one mirror in hand photography without worry. Waterproof ring material: amorphous high activity silicone 4. Material of the connecting shaft between the main body and rear cover: high hardness 304 stainless steel Installation steps: 1. When installing the camera into the fully invisible diving case, check if the camera is in the center position and gently shake to confirm that the camera is in the center . 2. Because the waterproof depth of the diving shell is 50 meters, the hardness of the button spring has a compressive standard . 3. When operating the diving shell button, it is necessary to gradually apply force when pressing with your fingers, and the more you press down, the stronger it needs to be. The button should be pressed down to its limit and stopped for 2-3 seconds. Wait until the camera indicator light is on before releasing the button. Waterproof:50M Product weight:134g Colour:Transparent Material:Plastic Size:156x84.2x83.6mm Package Contents: 1 x Action Camera Diving Case Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.