Features: Made of fine quality polycarbonate, ABS resist corrosion. 40m/130ft maximum waterproof depth, suitable for underwater photography. Fine workmanship, perfect sealing function, 360 full protection for your phone. Adopt seamless and fully enclosed process, protecting your phone against water, drops, scratches and dirt. Provide clear image view and easy controlling underwater. Easy to put into your phone, suitable for Huawei P20/Huawei P20 Pro/Huawei Mate 20 Pro. Perfect for using underwater, like diving, surfing, snorkeling, skiing, yacht or other activities.