Sony MZ-N420D Psyc Net MD Walkman Digital Music Player Store 5 Hours of music on 1 standard MiniDisc Record MP3s or CDs at up to 32x speed Uses high-tech, affordable MiniDiscs (1 included) Up to 56 Hours battery life with 1 AA battery The Psyc Net's recording features and bundled software are not compatible with the Mac OS operating system.