MP3 player 1.Music format:MP3, WMA, WAV 2.USB2.0 3.Built-in polymer Lithium battery 4.Warranty one year Shuffle 2 MP3 player Product DescriptionClip MP3 player, MP3, MP3 players, Portable MP3 Player 1. USB 2.0 transference as USB disk function 2. Built-in polymer Lithium battery 3. Supports MP3, WMA, WAV Fast delivery factory supply in best price