Comes with keyboard stand
49 Full sized keys
100 Tones
Auto Accompaniment
20 Demo Songs
There's one listed on ebay for $140 (http://cgi.ebay.com/YAMAHA-PSR-78-STEREO-MEMORY-KEYBOARD-UNIT_W0QQitemZ290065890573QQcategoryZ38091QQrdZ1QQssPageNameZWD1VQQcmdZViewItem) that claims these units went for close to $400 new so this is a pretty good deal.
I don't know anything about keyboards or what they are really worth, so I'm asking for 50 bucks.