Manage Music with App - H2O Audio App (Apple and Android) allows you to wirelessly manage all your music, add music to PLAYLIST+, create folders, delete or rename songs, and more. Bluetooth and waterproof mic - lets these headphones sync with your smartphone or music-enabled smartwatch to play podcasts, audiobooks, and playlists as you train. (Note that Bluetooth range underwater is only a few inches. We recommend using PLAYLIST+ for streaming audio underwater). Built-In MP3 Player - Transferring music from your computer to these over-ear bone conduction headphones is a breeze with the provided USB cable. With its 8 GB of memory, you can listen to hundreds of songs in most music formats. 100% Waterproof and Sweatproof - These headphones can withstand submersion to 12 feet (3.6 meters) under water. Our waterproof rating is IPX8, the highest in the industry. Feel inspired by your favorite music as you work out, rain or shine. Bone Conduction Technology - These open-ear headphones direct sound vibrations to the head and jaw bones, letting you enjoy music without blocking sounds from your surroundings. The battery offers up to 5 hours of playtime – ideal for triathletes. NOTE: Battery Life varies based on volume level and mode. Multi-Sport Waterproof Headphones - Enjoy your STREAMING music, like Spotify offline without a phone, underwater, anywhere with H2O Audio Patent Pending PLAYLIST+ feature. Bluetooth bone conduction headphones with a built-in MP3 player. It securely fits around your head for a wireless experience as you run or swim.