Creative Muvo Sport C100 256 MB MP3 Player 256 MB flash memory holds up to 8 hours WMA or 4 hours MP3 music; does not support copy-protected WMA Memory expansion slot for optional SD or MMC cards, up to 512 MB Built-in stopwatch including lap-timer, split-timer and countdown timer Included sports armband and case for exercise Up to 18 hours of MP3 continuous play on 1 AAA battery