I understand that this is just a broken encoder (everything breaks). I just thought that for the money the mouse would work longer. Pros below: Hassle-free and fast connection. Good plastic top cover. Multiple BT connection types and own adapter. It lives for a long time with batteries (I have never changed it for a year). A good solution with a magnetic top cover. "Clear" top buttons. Multiple DPI modes. 2 communication frequencies Hi and Low. Cons: Encoder. No not so ENCODER! Started to mow after 8-9 months after purchase. The scrollbar is worn like crazy in different directions when trying to scroll the wheel up or down. As I understand the problem is not only with me. The side buttons are large, but located so that they do not fall under the thumb (in principle, I practically do not use them, perhaps precisely because of this)