From the manufacturer, the Razer DeathAdder Essential + Goliathus Medium Bundle Hello Kitty & Friends Edition Demonstrated Performance History Maintain control at all times. A true 6,400 DPI optical sensor with a track record of performance for quick and accurate swipes is a feature of the Razer DeathAdder Essential. In the face of a chaotic battle, this allows you to maintain control with ease and fluidity. Traditional Ergon