i have a wireless logitech...and rechargable batteries for it.....never had a problem...oh ya...its the kind with the mini usb port thingee....you know? so it doesn't stick out 2" from my laptop....i leave it in all the time cuz i have three ports. it's only about 1/4" big. costs about 50-60$ but its always cheaper at staples when its on sale.....