Yamaha DTXpress/DTXplorer/DTXtreme

Hey man!  You could tell the guy to check the actual module and see 
if it says DTXPRESSII on it, because right now you know about the 
frame and its parts and you know about one snare pad, but you need 
to know about the most important part: the brain.  Its pretty easy 
to tell what brain it is and even if he doesn't know anything about 
e-drums he could figure it out.  Maybe get him to send you some digi 
cam pics?  Or maybe you should download some pics off the web and 
ask him if the set looks like that.  I know how it is to be in 
university and short on cash and the last thing I'd wanna do is buy 
the wrong set.  Good luck!