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 www.logitech.com/downloads). 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).