
I've had this mouse for around 3.5 years and it has outlasted my previous laptop. Battery lasts a good deal of time, 3-4 months, depending on how often I use it, and takes just 1 AA battery (also, to note, it must conserve power as I generally leave the USB plugged into my laptop). Also the mouse works great on various surfaces and fits perfectly in my hand. It's clicking is a little louder than I would prefer, but completely tolerable. The only con, is that upon trying to install the drivers on my new laptop, is that the software is not compatible with Windows 7. However, the mouse is still functional, including the general scrolling of the wheel (up, down, left, right) but has lost the functionality of the side button. Still plan on continuing use with this mouse. Get more detail about Microsoft Notebook Optical Mouse 4000--Dark Gray (B2P-00006).

