Any electronic device is only as good as the sum of its parts. In gaming mice, a sensor is the most important piece of the puzzle. And with Mad Catz" R.A.T. PRO X, you need not be afraid of your sensor becoming outdated. Hot-swappable modules help ensure that as sensors inevitably improve, R.A.T. PRO X improves with them. But it"s not just the sensor that you can modify. Almost everything you can touch is also interchangeable and adjustable. Nimble, robust, and immensely customizable, R.A.T. PRO X is the world"s most advanced gaming mouse.