Key Features . True 6400 DPI optical sensorErgonomic form factor5 Hyperesponse buttons10 million-click life cycle The Razer DeathAdder Essential retains the classic ergonomic form that’s been a hallmark of previous Razer DeathAdder generations. Its sleek and distinct body is designed for comfort allowing you to maintain high levels of performance throughout long gaming marathons so you’ll never falter in the heat of battle. Ergonomic form The Razer DeathAdder Essential retains the classic ergonomic form that’s been a hallmark of previous Razer DeathAdder generations. Its sleek and distinct body is designed for comfort allowing you to maintain high levels of performance throughout long gaming marathons so you’ll never falter in the heat of battle. 5 Hyperesponse buttons Independently programmable Hyperesponse buttons give you advanced controls for a competitive edge. Up to 10 million clicks The Razer Mechanical Switches last up to 10 million clicks for longer lifespan and extreme reliability. 6400 DPI optical sensor Allows fast and precise mouse swipes that offer greater control for the most essential gaming needs..