Swimming exercises your whole body and is easy on your joints. It is efficient, but can be monotonous and boring after a few laps. Conventional headphones need to be deep and tight in the ears to ensure the ear is sealed, especially during intense body movements. The painful experience and susceptibility to ear infection inhibit the popularity of headphones among swimmers. Supported by Bone Conduction technology, the Xtrainerz MP3 headphones are ear-free and eliminate these problems. Let's make swimming fun. Designed for swimming. IP68 waterproof. Can be combined with swimming goggles, swimming cap and earplugs. Lots of bass and high volume under water thanks to special equaliser. 4 GB memory supports MP3, WMA, AAC, WAV, WAV and FLAC audio formats. Aftershokz open-ear headphones fit securely even during intense body movement.