Features: Prevent the camera from bumping, wear-resistant and scratch-resistant 360-degree full invisibility, seamless panoramic image stitching underwater, blind spot all eliminated, waterproof 50 meters Lens material is PMMA, light transmission is 95%, after plating AR transmittance enhancement film, the light transmission can reach 98%. AS waterproof anti-fingerprint film, AS hardening film, surface hardness of 5H, comparable to ordinary glass hardness, anti-scratch Increased transmittance anti-fog film and anti water droplet film coating to ensure that the light transmittance when shooting is maximized, and strive to achieve the equivalent of shell-less shooting maximize, and strive to achieve the clarity of the equivalent of shell-less shooting The shell is made of hardened PC, inside and outside the No. 10 young texture support, making the product scratch-resistant, texture, anti-flower anti-fingerprints Adopt liquid silicone technology, enhance the waterproof function Specification: Material: PC Waterproof Ring Material: Amorphous High Activity Silicone Main Body and Back Cover Connecting Shaft Material: High Hardness 304 Stainless Steel Size: 16 X 85 X 84 mm Applicable Model: for insta360 X4 Package: 1x Waterproof Case+ 1x Invisible Base + 1x Screw + 1x Anti-fog Sheet + 1x Storage Bag + 1x Instruction Manual