The Commodore mpet II is a mp3 player. The Commodore mpet II can also be used as a voice recorder, USB memory stick or as a FM radio. The specifications are: Memory: 256 MB, Audio formats: mp3 (64 kbps - 320 kbps), wav and wma, Frequency range: 20 Hz - 20 kHz, Power supply: 1 x AAA battery (up to. 15 hours), FM tuner, Connections: USB 2.0, headphone and microphone.