Sony MZ-S1 S2 Sports Net MD MiniDisc Player Record MP3s or CDs at up to 32x from multiple sources (PC, CD, radio, and more) Plays back in ATRAC3, supports MP3, WMA, and WAV formats Easy one-hand joystick navigation; bright backlit LCD display Up to 54 hours' playback on one AA battery (in LP4 mode) Water-resistant design with reflective casing; includes music management software, reflective hand strap