This really is an outstanding product. Tracking is excellent on every surface I've had to use it on, including a fake sheepskin throw that I have on my sofa for my dog. The USB dongle is very small and can be left in the laptop. So small, in fact, that it's difficult to remove, but I no longer want to do so. The mouse has a real on-off slider. I haven't owned the mouse long enough to change the battery, so battery life has to be at least acceptable. Overall, I much prefer this mouse to its full size cousin, the MS Explorer Wireless Bluetrack mouse. I own both. This mouse has better ergonomics, a real on-off switch, and long life on a single AA battery (versus the Explorer which has a rechargeable battery that won't last one day; plus no off switch). I took one grade off of value for the high price. Also, one grade off of overall satisfaction because this mouse has its own proprietary 2.4 GHz wireless dongle instead of Bluetooth. Get a wireless keyboard and now you've got two dongles sticking out of your laptop.
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