http://www.buy.com/prod/razer-salmosa-3g-optical-gaming-mouse-w-1800dp-rz01-00240100/q/loc/101/211982497.html?adid=1765 The Razer Salmosa is the quickest entry level gaming-grade mouse armed with the fastest tracking optical sensor in the world. Designed to be one of the lightest and most compact mice of its class, it is the ideal mouse of choice for finger-tip grip gamers who seek both speed and control. 1800dpi 3G Infrared Sensor The Razer 3G Infrared sensor is rated as the fastest tracking optical mouse sensor in the world, enabling movement speeds of up to 2.25 times faster than other regular gaming mice. Ultra-Light Form Factor The Razer Salmosa features one of the lightest and most compact form factors in its class, delivering optimum freedom of movement for finger-tip grip gamers. Hardware Toggles for DPI and Polling Rate The Razer Salmosa comes with additional toggle switches on the bottom of the mouse that enable gamers to make 800/1800dpi and 125/500/1000Hz polling rate adjustments – without the need for any software drivers.