Summary: I've read the others, don't know what they are talking about! This thing practically installs itself. No problems whatsoever as long as you connect to the USB port on the computer and not on a hub!!! I'm connected to my front USB port, the transmitter is behind closed doors and I have never lost my cursor. I did have problems when connected to the USB port on my monitor. I think this port goes to sleep when your monitor does, therefore, no cursor.

Summary: The cordless Logitech Trackman trackball is simple to use, reliable, and comfortable. Because you can rest your hand on the Trackman while navigating on your computer (you control the Trackman with your thumb), wrist and arm strain are eliminated. The only negative is that you cannot open the Trackman to clean the internal mechanism when the trackball gets dirty. (I know this because I had a cordless Logitech Trackman trackball at work.) This is a minor inconvenience.

Summary: This is my fourth Logitech trackball and my second of this model (for work). Love it! If you spend a lot of time on the computer, this is the only way to go.