I've got a Logitech Cordless Desktop combo, and it's range is terrible. It works from my knee at my desk, but if I put the mouse up on the desk it gets really slow and doesn't register half of the times I click. The keyboard is a little delayed too I can tell, but that's a little more tolerable. Is there anything I can do to improve the range? Or do I need something bluetooth to accomplish this setup? The receiver is about 10ft from the mouse.