The black 100% Waterproof Headphones from Aquapac are fully submersible as well as compatible with Aquapac's 518 MP3 Player. However, you'll find they are also usable with any iPhone, iPod or MP3 unit that contains a standard 3.5mm headphone jack. These phones come with 3 different sizes of silicone earbuds to fit various sized ears. With these phones you can listen to your favorite music while sitting in a jacuzzi or, swimming pool. These headphones are characterized by a good bass and frequency response. Note! Although tested waterproof to 30' (10 m) you should not use them at depths greater than 10' (3 m) where the pressure could cause hearing damage.