Features: 1) High quality MP3 / WMA play 2) External voice recording (WAV) 3) Built-in FM radio 4) Plug and play 5) Built-in microphone 6) Firmware update 7) Text / ID3-tag display 8) 1 x AAA alkaline battery 9) Dimensions: 93 x 31 x 20cm 10) Operating system: Windows 98 / ME / 2000 / XP / MAC OS