IP68 Waterproof Design - Waterproof Headphones For Swimming, can be used with a swimming cap, goggles and earplugs, lightweight and comfortable. IP68 Waterproof Rating is completely waterproof, sweatproof, rainproof and dustproof, which makes them ideal for swimming, snorkeling, fishing and boating. Note: Bluetooth connection is not supported underwater, please switch to MP3 Mode. Built-in 32G MP3 Memory - swimming underwater headphones built-in 32GB storage, capable of storing up to 6,000 songs and support multiple formats like MP3, WMA, WAV, APE, FLAC formats. Note: Double-click the power button to switch between Bluetooth mode and MP3 mode. Bluetooth 5.4-bone conduction headphones adopts Bluetooth 5.4 technology, which ensures a stable Bluetooth connection, high-efficiency and durability, and a maximum Bluetooth connection range of 33 feet (10 meters). Compatible with iOS and Android devices, you can listen to music, audiobooks and make calls. Long Battery Life - Open Earphone