M190 wireless mouse features a contoured design that follows the natural curve of medium to large hands. It provides all-day comfort thanks to the arched palm support & special button scooping for ideal finger placement. You'll work wirelessly & move freely from up to 33 ft away with virtually no delays or dropouts. No cable means no clutter on your desk. An 18-month battery life means you can work worry-free, thanks to the power-saving mode which automatically kicks in when you're not using the mouse. You'll get great-quality navigation with precision tracking & line-by-line scrolling. Connector / Port / Interface: USB; Left / Right Hand Use: Left / Right; Mouse Technology: Optical; Wired / Wireless: Wireless.