The bottom button could be for a variety of things; you'll want to take a look at what you'll be doing before you press it. In a nutshell: I would recommend this mouse to anyone looking for a high-quality Logitech product at a reasonable price. features advantages: To the point where I can nestle it neatly under my "masculine" hand. I mean, look at that wheel, it's hot! Left- and right-clicking work fine. Have a ton of buttons, please. Negatives are listed below: I have read that the LMB and RMB have loud clicks, and that is something I would prefer to avoid. It's the same as in the Logitech Pebble that I took before the launch of the 3S. - Side scrolling isn't something I use much because I find other methods, like using Gui or clicking on a tab in a browser, to be more convenient. There's a button embedded in the bottom of the casing, but I never press it.
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