After being put to service for a period of four years, the wheel eventually reversed and failed. The issue was remedied by disassembling everything and giving it a thorough cleaning. In addition, the braid was torn closer to the connection point of the mouse itself (the use of black electrical tape is helpful in this regard, but it may have been soldered). keep using and enjoy! Some pros: The X7 is an attractive and dependable mouse that has a key arrangement that is pleasant and high-quality assembly on the mouse itself. Laser. Having this drawback: Wire that is prone to breaking at its connection point with the mouse (replaced with rubber braid)