Our Take 

OpenSwim is engineered with Shokz’s signature open-ear design and bone conduction technology to ensure bud-free, comfortable listening all day, in or out of the water. OpenSwim is completely waterproof and submersible, and features four gigabytes of MP3 storage, enabling athletes to train harder; no wires, no devices.

 Features:

• No more ear pain] Unlike in-ear headphones, OpenSwim wireless earphones are equipped with an open-ear design powered by bone conduction technology, ensuring bud-free and comfortable listening all day, in or out of the water
• [IP68 waterproof] OpenSwim bone conduction waterproof headphones withstand total submersion in up to 2 metres of water. Fully waterproof and submersible so you can swim, run, cycle, or train harder than ever before
• [Excellent Underwater sound quality] Boosted by 7th generation bone conduction technology, OpenSwim waterproof MP3 gives you a clear and consistent sound quality throughout all strokes and turns
• [Versatile And Secure Fit] OpenSwim bone conduction earphones are compatible with swim caps, goggles, and earplugs. OpenFit titanium design equipped with wraparound flexibility for reliable stability throughout all strokes and turns
• [4GB of MP3 Storage & 8H of music] NOT BLUETOOTH COMPATIBLE. With up to 8-hours powerful battery life and built-in storage for 1200 songs, you can continuously enjoy the extraordinary underwater sound quality