PolarPro Snorkel Filter-Shallow Water Filter for GoPro Hero4 Standard 40M Housing Fits Hero4 and Hero3+ Standard 40M Housing, Hero, Hero+, and Hero+ LCD cameras Professional shallow water color correction (2 to 15 feet deep) For use while snorkeling in blue or tropical water Secure push-on design for fast installation / removal 5 year warranty with PolarPro support (US based)