[. . . ] â· To clean, use a dry, clean cloth and no chemicals or water. [. . . ] â· Do not disassemble product or subject it to rough handling or abuse. Stand within 10 meters of the receiver and do not place metal objects in front of it. 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. [. . . ] Logitech, the Logitech logo, and other Logitech marks are owned by Logitech and may be registered. [. . . ]