These nearly microscopic cards hold 1GB of music, liner art, photos, videos and whatever other little extras artists may want to include with their albums. The players are very inexpensive at only $19.99 ($34.99 for the artist editions like the nifty Abba one I have) and make quite affordable gifts. They also don’t require a computer to either buy the music or play it. None of this would matter if you could only use these mini music cards on the player itself. The music needs to be transferable, and it is. The card contains unrestricted MP3s with very good sound quality that you can put on your phone if it has a slot or easily transfer to a computer with a USB adapter that comes with the player. I had those Abba tracks from the card blasting from my stereo speakers mere moments after popping the card in my computer. So, you can make playlists with the music you purchase this way and unlike music bought from iTunes or eMusic, you get host of extras with releases even beyond what appears on most CDs.