Excerpt: This is an optical mouse from A4 tech that my brother recently bought. It is in white color, also available in other two more colors: black, and silver. It is a PS/2 mouse, and we connect it to a serial port of our desktop PC.
Summary: This mouse is fantastic if you have applications which require a lot of double clicking - using the 2x button which is small and rectangular just to the left of the scroll wheel, you only need to single click it! I primarily use Linux (Ubuntu) and it works perfectly there, I have also tested it on Windows XP. I suffer from hand and wrist problems so anything which streamlines my computer use is good for me.