Edit: Sorry impeeza is correct about size of cable.
It is best to charge it from the usb port and not the wall adapter.
http://cgi.ebay.com/NEW-STYLE-WHITE-1GB-MP3-MP4-FM-PMP-PHOTO-MOVIE-PLAYER_W0QQitemZ300071597485QQihZ020QQ
Gives some details on it. You will have to check yours to see what size the memory is.