TRACKBALL COMFORT - Sculpted shape supports your hand and stays in one place—move the cursor without moving your arm
LONG BATTERY LIFE - 3 year battery life and smart sleep mode help you go longer between battery changes
CONVENIENT CONTROLS - Easy-to-reach Back/Forward buttons makes moving quickly between documents or browsing your favorite Web sites a breeze
MICRO-PRECISE SCROLL WHEEL - With more grooves per millimeter, our new scroll wheel gives you the ultimate navigation experience.
PLUG'N'PLAY CONNECTION - Nano-sized Logitech wireless unifying receiver stays in your computer— plug it in, forget it, even add compatible wireless devices without multiple USB receivers