The VX Nano does a few things differently from the VX though. First, and most importantly, it is smaller, so it is that much more portable than the older mouse. Secondly, the Nano has an incredibly small RF dongle. This device is under 0.75" long, so is composed mainly of the metal USB housing and will only stick out of your computer about a quarter of an inch. Like on the VX Revolution, the dongle can be stored inside the mouse so you won't misplace it, though it is so small enough that you can just leave it in your notebook. Unlike the VX and MX, the VX Nano uses an ambidextrous design.