The mouse itself is very chic and portable, fits comfortably in de hand (for small hands), but the description 'compatibility with Mac OS X 10.5 or later "is selected too generous because compatible, only the standard functions (scroll, left- and right-click). When moving the mouse wheel horizontal namely nothing happens and can not even change or set (the Control Center from Logitech that you can download to the mouse does not recognize, so you can no settings). What you should know if you consider to purchase this mouse as Mac users.