If you buy a typical wireless notebook mouse today, the USB adapter the thing needs can be about the size of a traditional pack of gum. That’s not so bad if you are working form a desktop that you never move, but if you are working form a notebook that you carry around the chances of breaking that big dongle are good.
A while back Logitech introduced a VX Nano cordless mouse with a tiny USB dongle to prevent damage. Verbatim has now unveiled a very similar wireless mouse called the Nano Wireless Notebook Optical Mouse. The mouse has a tiny USB dongle that only protrudes from the notebook a few millimeters.