Whether you're a righty or a lefty, whether you use a fingertip or palm grip, your hand is cradled naturally and comfortably. You get one-touch access to the Windows 8 App Bar, Charms Bar, Desktop and Start Screen. In free-spinning mode, you can coast smoothly through the longest documents. In click-to-click mode, you can step precisely through spreadsheets, photo albums or playlists. Deep, contours. Soft, rubber grips. Whether you're a righty or a lefty, your hand is cradled naturally and comfortably-hour after hour. Switch instantly between the traditional Windows desktop and apps and the new, full-screen Windows 8 interface. Or customize the thumb buttons to do exactly what you want them to. (Customization requires Logitech SetPoint software, available for download at www.logitech.com/downloads.) The tiny receiver practically disappears in your computer's USB port, so there's less chance of it being broken or damaged. Plus, you can easily add a compatible keyboard, number pad or even another mouse-without the hassle of multiple USB receivers.