SONY NWZ-W252 mp3 Player, Memory Capacity - 2GB, Removable Memory - No, Supported file formats - MP3, WMA, Software - Zappin song search technology

Sony NWZE453 MP3 Player, Memory capacity - 4GB, Voice recording function - Yes, FM radio - Yes

Philips GoGear Vibe SA2VBE08K/02, Memory - 8GB, FM radio - Yes, Software - Philips Songbird, File Support - Napster, Audible, Rhapsody

SONY NWZ-W252 MP3 Player, Memory Capacity - 2GB, Removable memory - NO, File Supported - MP3,WMA, Software - Zappin song search technology