This Logitech Revolution mouse is a high tech device that is the worst mouse I have ever used. All the functions work as advertised. What is bad is the Logitech driver software. My computer has an Intel Dual core CPU at 2.33GHz performance. I am using WinXP. The performance is so bad that the computer is often 3 or 4 clicks behind. Often, the computer does not respond to 3 or 4 clicks at all. This Revolution mouse replaced a Logitech MX Laser mouse that had similar problems but not as bad. I assumed (my bad) that a newer mouse would have superior performance. When installing the new mouse, I discovered that both mice used the same software. The mouse may be great but the Logitech software is totally poor. I would not recommend this trash or any other cordless Logitech device to my worst enemy.