From Shokz
• Bluetooth + MP3 Modes + Shokz App - Stream Bluetooth music and podcasts, or listen phone-free with internal MP3 storage for up to 8,000 songs. Toggle between modes and tailor your audio experience with the Shokz App. • IP68 Waterproof Rating - With a triple-sealed design, OpenSwim Pro is fully sweatproof and can be submerged in water up to two meters deep for two hours, for built-in MP3 audio play while swimming. • Open-Ear Comfort and Connection - Our headphones are designed for enhanced safety and extended listening.