The left button is the main one! backlash as it is unknown what creaks and is pressed fuzzy while the right one has an excellent click if not for the quality the assembly of the mouse would be top-end but the main button is complete slag even in China for 400 there is no such thing; I handed over the mouse back to the store When buying, carefully unpack and save all stickers. P. S I ordered another one and voila, the button clicks normally, though the wheel it crackles a little harder than in the first one, but you can still survive it, so you just need to find a high-quality assembled copy, I'm lucky from the second time :D
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