H2O Audio is a company based in San Diego, California, which develops accessories for portable media players. During 2008 it was notable for being one of the top 500 fastest growing companies in the United States. H2O Audio has international distribution system covering over 30 countries, including the United Kingdom, Australia, Mexico and Japan. H2O Audio's motto is "Your Sport, Your Music", and their sponsored athletes include Michael Phelps, Natalie Coughlin, Laird Hamilton, and triathletes Greg and Laura Bennett.