"The HipZip has all the bells and whistles of a current day MP3 player: a
USB interface, support for both MP3 and WMA formats, secure download
support, and the ability to be upgraded for future formats and security
standards. As with the MP-2300, the unit comes with 2 PocketZip discs, and
features a built in Li-Ion battery rated for up to 12 hours of play."