**A wireless mouse with a tiny, leave-in receiver & laser tracking that works wherever you do--even on glass.** ** Darkfield Laser Tracking** You get accurate, precise cursor control on virtually any surface, even glass tables (4 mm minimum thickness) where optical & standard laser mice fail. Turn the world into your mouse pad. ** Logitech® Unifying receiver** The tiny receiver stays in your notebook. Plus, you can easily add a compatible wireless mouse or keyboard--without the hassle of multiple USB (Universal Serial Bus) receivers. Learn more about the Unifying receiver. ** Compact, ergonomically designed** The compact, ergomomic design helps keep you comfortable wherever you want to use your laptop--at home, at work, or on the go. Comfortable hands like comfortable mice. ** Hyper-fast scrolling** You'll fly through documents & Web pages with a single spin. Click-to-click scrolling gives you the precision you need when navigating lists, slides, & images. Excited about hyper-fast scrolling? ** Integrated thumb buttons** There's more control within your reach. Move quickly backward or forward through Web pages & within applications. Change the cursor speed? Change the cursor? Change the programmable buttons? Find out more about Set Point software. ** Logitech® Advanced 2.4 GHz wireless** You get the reliability of a cord with cordless convenience & freedom--fast data transmission & virtually no delays or dropouts. Learn more about Logitech wireless technologies.