You'll have up to three years of power.
With the Logitech M705 910-001935 Marathon Mouse you can forget the hassle, expense, and waste of frequent battery changes. The Logitech Unifying receiver that comes with the Logitech M705 910-001935 Marathon Mouse, the tiny, wireless receiver that stays in your notebook and lets you add devices as you need them. Plus, the Logitech M705 910-001935 Marathon Mouse also features hyper-fast scrolling - one spin and you may never go back to an ordinary scroll wheel. Plug it.