Offline playback and onboard storage

One review specifically said nap-mode audio is stored on the headphones, supporting limited onboard/offline playback for soundscapes rather than music storage.

The local-memory feature is the reason to buy these. Reviewers like the 8GB storage, drag-and-drop loading, and true phone-free swimming, but Playlist+ is often described as clunky, slow, or awkward, and 8GB trails some rivals.