I picked up this mouse at a zellers on sale for basically the same price as on amazon. This is a very simple mouse and it doesn't come with any instructions or software, but really, who needs it? It connects automatically when connected to your laptop after a minute of windows searching for drivers. All of the buttons work, and i've had it for half a year and haven't needed to replace the batteries yet. The only two downfalls to this product are that it does not support assignable keys, you are stuck with the two explorer keys, and that since there are no instructions you wouldn't know right away that the button in the middle is for switching the dpi. Otherwise it has worked like I expected and it is decently compact.