[. . . ] [. . . ] PC desktops with USB port only and PC notebooks use black USB connector only. English Install the batteries: the mouse uses 2 large AA batteries; the keyboard uses 2 small AAA batteries. Logitech, the Logitech logo, and other Logitech marks are owned by Logitech and may be registered. Logitech assumes no responsibility for any errors that may appear in this manual. [. . . ] [. . . ]