The Kone Air Wireless Ergonomic Gaming Mouse is designed to equip gamers with maximum versatility for both work and play. The 2.4GHz Stellar Wireless provides a lag-free gaming experience or switch to Bluetooth mode for on-the-go productivity and reduced power consumption. Power up with two AA alkaline batteries for maximum battery life or a single battery to achieve a lighter weight. Perfected through years of refinement, the beloved Kone ergonomic shape ensures comfort even in the most intense gaming sessions. With ample support for your palm and durable Double-injected rubber side grips, placing your hand on the Kone Air is an unmistakable feeling ergonomic perfection. The multibuttoned design is complimented by Easy-Shift[+] button duplicator technology, expanding 9 buttons into 17 programmable inputs, allowing for easy macros and actions. Just hold down the programable Easy-Shift[+] button to access the arsenal of secondary functions. The Kone Air is packed with several proprietary ROCCAT technologies designed to help you achieve maximum in game performance. ROCCAT;s Titan Switches combine with the 19K DPI Owl-Eye Optical Sensor to provide unrivalled speed, accuracy, and responsiveness. STELLAR WIRELESS WITH BLUETOOTH - Switch between gaming grade 2.4GHz Stellar Wireless for low-latency gaming and Bluetooth for extra versatility. 800-HOUR BATTERY LIFE - Take it TO-GO, anywhere and anytime, with up to a year of use without swapping batteries. SINGLE OR DOUBLE AA - Power up with two AA alkaline batteries for maximum battery life or a single battery to achieve a lighter weight. ERGONOMIC DESIGN WITH RUBBER SIDE GRIPS - Perfected through years of refinement, the beloved ergonomic shape fits perfectly in the palm of your hand with double-injected rubber side grips. MULTI-BUTTON FUNCTIONALITY - ROCCAT Easy-Shift[+] technology unlocks a second layer of functionality for every button expanding 9 buttons into 17 programmable inputs. Just hold down the remappable Easy-Shift[+] button for secondary functions. TITAN OPTICAL SWITCHES - ROCCAT;s Titan Optical Switches provide instantaneous actuation, and incredible durability with a 100 million click life cycle offering a competitive edge game after game. OWL-EYE OPTICAL SENSOR - Experience smooth, precise tracking thanks to ROCCAT;s Owl-Eye 19K DPI Optical sensor. PTFE GLIDES - The Kone;s heat-treated, pure PTFE feet deliver incredible glide and the smoothest mouse movements right out of the box.