I use a Kensington wireless mouse with my Apple Powerbook because of their confounded single button configuration. The Kensington mouse actually has a garage built into the side of the mouse to place the USB dongle when storing the mouse. This way all parts are together when stored and when the dongle is parked in its cubby, it shuts off the mouse so no battery drain. Medium sized mouse as well. I have been very pleased with the Kensington model after disappointments with Targus and Logitech models. The Targus was too small and didn't shut off by any external switch, so major battery drain. The logitech mouse was buggy and would frequently disconnect.