H2O Audio Sonar 2 PRO Waterproof Bone Conduction Headphones Swimming Open Ear Underwater IPX8 MP3 Player Playlist App Bluetooth Streaming

Community verdict

The H2O Audio Sonar 2 PRO earns a 6.8 out of 10 for providing a functional open-ear audio experience that makes long swimming laps far less monotonous. Swimmers praise the secure fit under caps and caps' straps, alongside solid underwater audio clarity when paired with earplugs. However, users express significant frustration over the tedious process of acquiring and loading offline MP3s or long real-time audio transfers, as standard Bluetooth streaming cannot penetrate water.