The first mouse that died so quickly, now here's an adventure with a guarantee for the new year, thanks for congratulating Logitech. . I received a new one under warranty in a couple of weeks, I'm satisfied. The best warranty support I have ever encountered Pros below: It lies perfectly in the hand, positioning accuracy, pleasant tactile effects from scrolling and buttons. With its cons: A little more than 2 months after purchase, the scroll wheel broke. Without any hint, in one second, it began to rotate without any resistance and effect in applications. Clearly a mechanical defect.