Okay guys I'll admit this thing is tiny, but cool tiny. Maybe even Novelty tiny, like Zoolander's Cell Phone (freakin funny). 3 inches long by 1.5 inches wide and just under an inch in hight/depth. It's handy as heck! It feels well built, the mouse wheel is stiff which is good because i expect that to wear on any mouse and it would be bad news if it felt flimsy out of the box. It also should be noted that it ships with a neat little pouch in case you dont have a laptop pocket for it. The optic sensor is responsive, i can use it on a rough wooden table or a reflective desktop and have no problems. In summary.... Im happy, my wife thinks its "cute" and im no longer getting cramps from using my touch pad.