Logitech® Marathon Mouse M705 lets you power on. . . and on. It uses far less power than comparable wireless mice from other companies, so you'll go up to three full years between battery changes. * And it uses a tiny wireless receiver that stays plugged in to your computer, so your mouse is ready to go-whenever, wherever, and for as long as it takes. Plus, hyper-fast scrolling means you'll fly through long documents to find what you need in a flash. Laser grade tracking means you'll get smooth, responsive cursor control. And the sculpted, right-hand shape means you'll be as comfortable finishing up as you were getting started.