An excellent mouse, the same one has been working for friends for more than a year. I was not lucky - on the 4th month of operation, the LKM and PKM microcontrollers broke down. They click a few clicks, do not hold the button pressed. I contacted Logitech support. During the week they asked me to do everything that I already did. The result, as expected, was not. As a result, they sent a new device to replace it. Came by the way for 2-3 days.