MP3 + Bluetooth Modes: The bone conduction earbuds with Bluetooth 6.0 technology deliver low transmission latency for faster, more stable connections. Support simultaneous connection to 2 devices. Built-in 32GB MP3 storage holds up to 8,000 songs. Double-click to easily switch between Bluetooth and MP3 modes IP68 Professional-Grade Waterproof: Resists sweat and rain during sports. Submersible in 2-meter deep water for up to 2 hours, ideal for swimming or other underwater activities (Note: Switch to MP3 mode underwater; Bluetooth mode does not work underwater) Open-Ear Design: Frees you from the ear canal pressure of in-ear buds, reducing ear strain while keeping you aware of your surroundings for safetyperfect for running, cycling, hiking and other sports. Equipped with a noise-suppressing microphone, it ensures clear call quality even in noisy environments 10 Hours of Music & Download: Enjoy up to 10 hours of continuous music, calls, and podcast playback on a single charge