Popped in to grab an Aspire one earlier, sold out :(
But found these on the shelf, my other just died, so perfect price! Seems to work just fine.
USB Mini receiver.
800dpi sensor resolution
2 AAA Batteries included
Says right hand use only, but don't see any reason why a lefty can't use it, it's just got a piece of rubber where the thumb goes for a right hander.
Instore only, can't see it online.