Ergonomic mouse design work. BlueTrack technology is exceptional, I use both on a glass table on a sofa! Nothing to do with my old wired mouse and her little red light that I could barely make it work on my coffee table. The nano receiver is very discreet, which allows me to carry my laptop in a bag without having to disconnect the mouse. I do not have opinions about the autonomy of the beast. Only negatives on the board: the click of the dial is a little "difficult," I would have liked an easier button to press to navigate between tabs quietly a browser. It is also unfortunate that we should turn off the mouse after use, we would have appreciated that Windows can automatically turn off the mouse while it stops the PC.