Diamond Multimedia Rio is the first portable MP3 music player. The portable player can store up to 60 minutes of digital quality sound, it's smaller than an audio cassette, has no moving parts, and is under $200. Rio takes 1 AA battery and gives you up to 12 hours of continuous playback. For a complete listing of all our portable mp3 players, please see our main mp3 players page. For the latest product information on the Diamond Rio check the websites below.