The compact Philips MP3 Player with direct USB makes file transfer a snap as no cables are required. Philips GoGear Mix 4GB MP3 Player, SA3MXX04KC: MP3 and WMA playback Audio compression technology allows large digital music files to be reduced up to 10 times in size without radically degrading their audio quality. MP3 or WMA are two of the compression formats that let you enjoy a world of digital music on your GoGear player.