Rio S35S Sport Digital Audio Player 128 MB on-board memory; expandable up to 256 MB via MMC cards Supports MP3 or WMA files; upgradeable for future music formats; PC and Mac compatible Integrated FM tuner, clock, and stopwatch; water and impact resistant Up to 10 hours' playback on one AAA battery; accepts NiMH rechargeables Includes earbuds, carry case with clip and armband, AAA battery, USB cable, and music management software