Sony NW-MS70D Network Walkman Compact Design fits comfortably into your palm, pocket, or purse 256 MB built-in memory (up to 12 hours' storage) with MagicGate Memory Stick Duo expansion slot Plays MP3, WMA, WAV, ATRAC3, and ATRAC3plus media formats Fast USB connection; includes music management software for compiling and transferring custom playlists Includes headphones and USB recharging cradle