Shokz OpenSwim Pro
32 GB of MP3 storage and IP68 down to 2 m for 2 hours. Bluetooth drops underwater, so swims run on MP3 mode at 6 h.
What the maker states
| Battery | 9 h, Bluetooth; MP3 mode is 6 h |
|---|---|
| Weight | 27.3 g |
| Water rating | IP68 |
| External sensors | Bluetooth 5.4 |