Good to know- The precise optical sensor works on almost any surface, so it's great for portable working- Go wireless with the 2.4 GHz connection - just plug in the USB dongle to take control- With up to 1 full year of battery life, you won't need be constantly switching out batteries- Whether you're a lefty or a righty, the ambidextrous mouse is comfortable for everyone to use- The ergonomic design feels natural to hold, so you can stay focused all day