"For optimum performance, the wireless receiver must not be near any items
that may cause interference, such as computer monitors, large metal objects or
I guess if you plan on using your mouse near a computer, you're just screwed. If you're also in an office and have a file cabinet, forget it.
I also want to point out that the same manual devoted two pages to the setup and operation of the mouse and four pages to "healthy computing," which includes instructions for proper posture and wrist alignment when using your new mouse. What's next, "How to take a long shit without your legs falling asleep?" Now, that's information I could use.