OPEN EAR DESIGN WITH SOFT LIQUID SILICONE MATERIAL: Our open ear headphones are designed for ultimate comfort and awareness. Made from the softest liquid silicone, these headphones provide a comfortable fit for extended wear. Experience superior bone conduction technology that delivers high-quality sound while keeping your ears open to ambient sounds, perfect for swimming, running, cycling, and other outdoor activities. IPX8 WATERPROOF RATING: Dive into your favorite activities without worry. Our headphones feature an IPX8 waterproof rating, making them ideal for swimming and underwater sports. Whether you're in the pool or facing heavy rain, these headphones can handle it all.(Note: For underwater swimming, use the MP3 playback mode as Bluetooth cannot transmit underwater.) BUILT-IN 32G MP3 MEMORY: Leave your phone behind and enjoy your favorite music with the built-in 32G MP3 memory. Store up to 8,000 songs directly on the headphones and enjoy uninterrupted