The full-size, contoured design and soft side grips keep your hand happy and in control. You can do more, faster with Back/Forward buttons and side-to-side scrolling plus zoom (Requires Logitech SetPoint software (Windows) or Logitech Control Center software (Mac OS X), available for download at You might just forget this mouse runs on batteries with its hassle-free two-year battery life (Battery life may vary based on user and computing conditions).