Sony NW-S706FV 4GB Walkman(R) MP3 Player - Violet Package Contents - MP3 Player with rechargeable batteries, Noise-cancelling Headphones,Software,USB Cable, instruction manual Storage Media - Internal Flash Drive, Total Included Memory - 4 GB Additional Features - FM Tuner Power Source - Rechargeable Batteries, Average Playback Time - 50 hours Audio Codecs Supported - AA (Audible), ATRAC3, ATRAC3plus, MP3