In an ideal environment, your M555b mouse can operate up to 30 feet (10 meters) from the receiver.

If you're not getting this distance, try these suggestions:

• Replace the batteries and make sure your mouse is fully charged.
• Move devices that emit radio waves or could cause radio interference away from your work area.
  (Examples: cell phones, radios, wireless routers, microwaves)

To see if your environment is shortening your operating range, try using your wireless mouse in a different environment to see if the distance improves. If it does, look for other possible sources of interference you can remove from your work area.