Built-in 128MB memory. Digital Voice Recording Function up to 8 hours. Mobile Data storage function. Dot-Matrix LCD displays song title, album and artist information. Mini USB interface for fast down/up loading. Digital preset equalizer (normal, classic, rock, jazz, pop). 15 hour continuous playback. Upgradeable firmware. PC & Mac compatible. Requires 1 "AA" battery (not included). Unit measures 2.2"x2.75"x.75