High Transmission: The lens of this housing case is made of high quality optical tempered glass which ensure light transmission rate up to 98%. It delivers maximum image sharpness above and below water. Waterproof: Waterproof up to 196ft(60m), offer reliable protection for sea diving and extreme activities. Rustproof in Seawater: All metal parts of this housing case are made of 316 stainless steel, which is rustproof in seawater. Wide usage: Ideal for diving, surfing, snorkeling and other water sports activities. It can also protect your camera from dirty, dust and scratches etc. Compatibility: Perfectly compatible with GoPro Hero 4 Session, GoPro Hero 5 Session, GoPro Hero Session cameras, not fit for other versions camera.