Interval Swim Headphones compatible with Series 2 and above

H2O Audio, best known for its range of waterproof headphones, now wants to help you get some audio motivation from your Apple Watch when you next take a dip.

Its new Interval Swim Headphones are designed to be used specifically with Apple’s smartwatch with a band that clips to the Watch and then is connected with any set of swim goggles.
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https://www.wareable.com/apple/h2o-audio-apple-watch-swimming-headphones-price-release-date-specs-7723