It's name is certainly better than the i.beat Blaxx, but this thing is seriously small. Clocking in at only 1.7 inches long and a half an inch wide, the Microkey from Zicplay is tiny!
It weighs half an ounce and gets 6 hours of battery life. It acts as a 1GB USB 2.0 thumb-drive and will play MP3s that are transferred to it.
to read more go here
http://www.engadget.com/2007/09/14/zicplays-microkey-mp3-player-is-barely-there/