iriver ChromeX iMP-150 CD/MP3 Player with 120-Second Anti-Skip and Upgradeable Firmware Supports music CDs, home-made CD-R and CD-RW with MP3, WMA, and ASF Upgradeable firmware allows additional format compatibility going forward Enhanced anti-shock mode with 40 seconds of skip protection for audio CDs, 120 seconds for MP3, and 240 seconds for WMA WinAmp playlist playback support; up to 16 hours playback on 2 AA batteries (not supplied) Recognizes discs in packet-write format