Power on-a wireless mouse that runs for up to three years on one set of batteries. Forget the hassle, expense, and waste of frequent battery changes. You'll have up to three years of power. Logitech Unifying receiver-the tiny, wireless receiver that stays in your notebook and lets you add devices as you need them. Hyper-fast scrolling-one spin and you may never go back to an ordinary scroll wheel. Power on—a wireless mouse that runs for up to three years on one set of batteries. Forget the hassle, expense, and waste of frequent battery changes. You’ll have up to three years of power. Logitech Unifying receiver—the tiny, wireless receiver that stays in your notebook and lets you add devices as you need them. Hyper-fast scrolling—one spin and you may never go back to an ordinary scroll wheel.