M190 Full-Size Wireless Mouse (Charcoal) - LARGE-SIZE COMFORT - Optimal comfort for either hand with a contoured shape designed to follow the natural curve of large hands. Buttons scooping guides fingers into ideal placement. LAG-FREE WIRELESS CONNECTION - Work wirelessly and move freely - from up to 10 meters away - with virtually no delays or dropouts. No cable means no clutter on your desk and easy transporting. UNCOMPROMISED QUALITY - Get great quality with precision tracking and accurate line-by-line scrolling at an affordable price. Easier navigation with no annoying missed clicks. BUILT TO LAST - Durable and reliable quality from the #1 world leader in mice and keyboards. An everyday computer mouse you can depend on for a longer time. 18-MONTH BATTERY LIFE - Enjoy months of worry-free usage. Power-saving mode automatically kicks in when you?re not using the mouse to save power. AA Battery Included.