EXTRA CONTROL RIGHT WHERE YOU NEED IT Two customizable thumb buttons make it simpler and faster to get things done. A NEW, MORE POWERFUL SCROLL WHEEL The new Dual-Axis wheel gives you instant access to the App Switcher and Charms Bar. OUR SMALLEST RECEIVER EVER Just 3 mm long, our plug-and-forget pico receiver practically disappears in your computer’s USB port. WORK AND PLAY LONGER You’ll get up to 18 months of battery life from a single AA. TWO EXTRA THUMB BUTTONS