Mad Catz The Authentic R.A.T. 4+ Optical Gaming Mouse – Black. The Mad Catz R.A.T. 4+ Gaming Mouse lets you take control of your gaming experience. Bring precision to your gaming with the R.A.T. 4+ Gaming Mouse. Multi-button functionality lets you take control of your gaming experience. An adjustable DPI button lets you increase or decrease the DPI instantaneously, up to 7200. The precision button instantly increases or decreases the sensitivity, perfect for in-game sniping. With the included desktop software, you can create unlimited profiles for your mouse and quickly switch between the top four using the profile button. Built with a lightweight design, the R.A.T. 4+ only weighs 90g (without cable), ideal to take on-the-go. Create the perfect grip with the adjustable palm rest, letting you play in comfort. And with industry-leading OMRON switches, the R.A.T. 4+ can keep up with the even most furious clicker, with a 20 million click lifetime.