"Most, if not all, swimming headphones play music through streaming audio files from a built-in music player. Some also offer the option of streaming over Bluetooth, which is mainly present to make the headphones more useful when you're back on dry land. You have to store files on the headphones themselves, because Bluetooth and water don't really mix. The frequency on which Bluetooth operates is absorbed by water, which in turn impacts signal strength."
"If you've ever attempted to stream music with swimming headphones, this is why you probably got regular connection dropouts. You will typically be able to send music to your headphones by using the same cable that you use to charge it. You will have to plug it into your computer to send files to your headphones, unless the headphones offer the ability to sync files from a companion smartphone app."
Most swimming headphones play music from a built-in music player that requires storing audio files on the device. Some models include Bluetooth for dry-land use, but Bluetooth signals are absorbed by water, causing connection dropouts underwater. Users transfer files via the charging cable to a computer or through a companion smartphone app when supported, then drag and drop compatible audio files into folders. Supported audio formats vary by model, so format compatibility should be checked before purchase. Users must own or legally download audio content; streaming services are generally unusable because most streaming audio is protected by DRM, though some limited workarounds exist.
Read at WIRED
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