[【32GB MP3 Storage】Equipped with 32GB MP3 storage for more than 9000 songs you can enjoy your music even without your mobile phone so you can listen to your music while swimming or showering. (Note: Please use MP4 when swimming Bluetooth signal cannot be transmitted underwater) 【IPX8 Waterproof Design】IPX8 Waterproof Swimming Headphones professional waterproof design ensures that the headphones can be used continuously up to 3 metres. Perfect for swimming and worry-free use during rainy workouts. 【Open-ear Comfort】Open headphones with bone conduction technology ensures comfortable all-day listening without earbuds keeping your inner ear canal clean and allowing you to enjoy your music while being aware of the sounds around you. Perfect for indoor and outdoor sports such as running cycling walking exercising travelling. "【Bluetooth 5.4 Technology】The open headphones use advanced Bluetooth 5.4 technology for faster transmission speeds and more stable connections. You dont have to worry about Bluetooth disconnection when listening to music audiobooks podcasts or making phone calls. (Underwater Bluetooth signal transmission may be limited when swimming please switch to MP4 mode)" 【8 Hours Battery Life】The underwater swimming headphones are equipped with a 200mAh battery to enjoy 8 hours of continuous music/talk time and 72 hours of standby time. Fully charged in just 3 hours using the magnetic waterproof charging port.]