Bestpriceam Waterproof Mp3 Music Player for Swimming SPA, 4G 4GB, Black Metal MP3 and USB stroage,2 in 1 function. Built-in 4G memory, Music format: MP3,WMA. Rechargeable Battery each time last for 8-12 hours. Supports FM Radio, Support USB charge, Classification of waterproof: IPX8. Good for most sports, specially designed MP3 player for swimming, spa, and other water sports