Summing up, for a product, or rather a mouse that costs more than 5000, the description says gaming, implies serious loads, it turned out to be just rubbish from Logitech. : I close the issue with this manufacturer. With its pros: Comfortable mouse, fits well in the hand, weight can be adjusted by inserting one or two batteries, normal software. I think everything Cons: Six months later, when scrolling, it began to pull, then up and down, as it turned out, the encoder died. Reading the reviews of other customers, I realized that the problem was massive, as a result I ordered other encoders and replaced them in the service. : the middle button fell off - double click or no click, Logitech is a fiasco!