Product Overview . Productivity Meet Performance Optimized for both work and play the Razer Atheris is packed with features such as industry-leading signal stability dual-connectivity and over 300 hours of continuous use* all in a pocket-sized ergonomic body focused on delivering performance and productivity. *Battery life may vary based on connection type.350-Hour Continuous Use on a Pair of AA Batteries*When you\'re constantly traveling for work or busy with back-to-back meetings you don\'t want to worry about replacing batteries. Which is why the Razer Atheris is engineered to give you over 300 hours* of interruption-free use.*On Bluetooth connection. 7200 DPI Optical Sensor With a 7200 DPI optical sensor the Razer Atheris has one of the highest DPI for a mobile mouse. It gives you extreme accuracy and incredible control over spreadsheets or headshots. The extra resolution works perfectly for multiple monitors and even 4K screens and beyond. 2.4 GHz with Adaptive Frequency Technology* Featuring Razer\'s proprietary wireless technology the Razer Atheris provides you with industry-leading transmission stability. So whether you\'re in a café or the office where multiple wireless devices may interfere with the frequency your mouse maintains a solid connection. *Optional 2.4 GHz dongle included..