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LISTEN UNDERWATER WITH CONFIDENCE: 100% waterproof bone conduction MP3 player designed for swimmers, triathletes, and open-water training. NO EARBUDS, NO LIMITS: Bone conduction technology delivers clear, balanced sound through your cheekbones. Perfect for pool or ocean swimming. EASY TO USE: One-button control and fast file upload from any computer. 16GB internal memory stores up to 2,500–3,000 songs (MP3, MP2, MP4, FLAC, M4A, AAC). LONG BATTERY LIFE: Up to 4 hours of continuous underwater playback per charge. Up to 10 days of standby time when not in active use. Up to 8 hours of total mixed-use battery for land + swim sessions. Bluetooth mode works on land for training. WATERPROOF & COMFORTABLE FIT: 5 ATM waterproof bone conduction MP3 player - safe for swimming and training in pool or open water. Sleek 35 g design fits securely and comfortably on your head without earbuds. IMPORTANT BEFORE USE: Fully charge the device before first use without unplugging it. Recharges in about 1.5 hours via magnetic USB cable. If unused for a long time, recharge to maintain battery performance.