3 additional buttons, left / right scrolling, notched wheel or free, depending on the choice via a separate button (not by a click wheel).
Quick installation, software for customizing buttons without being heavy, tiny Unifying receiver.
The mouse is also compact and will fit a laptop, without being too small to handle and require fingertip.
And with the latest generations of mice, an autonomy that allows you to forget this mouse runs on batteries for quite a while.
Damage, however, that after 2 years this mouse still costs 40 (for an initial price of 45?), Even if you feel it may take a few years :)
