Wow, nice tip! I used a retractable USB mini mouse I'd picked up at a conference (looks like it's this model http://www.worldwide-usa.com/miniopticalmouse-p-s66090.html?gclid=CLXz44iXprcCFQua4Aod0ywAEQ -- could print some up with the Tesla logo :wink:). Mine is transparent illuminated...