In the idea, the concept is interesting. Yes Having already tried and used for a few months headphones / wireless waterproof player, I quickly felt hampered by the cable during swimming. The wire pulling the-ear headphones, you lose sometimes, which quickly becomes annoying regularly interrupting our pace.
For the rest, it is well sealed, features a proper autonomy for reduced loading times (3h). The sound quality has nothing dexceptionnel but we not necessarily need a HD sound under water;)
In summary, I naurais not convinced and I prefer unimpeded models (but more expensive).
