1The light transmittance of the lens is as high as 95%, and the picture is clear and bright. 2Using highquality PC plastic, it is sturdy and durable and protects the sports camera in all directions. 3The alloy button is resistant to oxidation and corrosion and can be used for a long time. 4With universal interface, it is easy to use with other equipment. 30m / 98.4ft deep waterproof to meet your needs. 5It is very suitable for water activities such as diving and surfing, and it can also record riding on rainy days, suitable for SJCAM SJ9 sports camera.