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 computers USB port. Work and play longer Youll get up to 18 months of battery life from a single AA. Two extra thumb buttons Extra control is right where you need it so its simpler and faster to get things done. They come programmed for Windows 8 Start screen and Desktop switching functions but can be configured to do exactly what you want them to. New Dual-Axis wheel You get smooth scrolling plus instant access to the Charm Bar and App Switcher so you can experience new Windows 8 navigationeffortlessly and confidently. Plug-and-forget pico receiver Just 3 mm long our smallest-ever wireless receiver practically disappears in your computers USB port. Since theres no need to unplug it when you move around its ideal for portable computers like laptops and Ultrabook devices. Unifying-ready Connect up to 6 Unifying-compatible devices to the same receiver. Add a keyboard switch between mice mix and match to fit your lifestyle. All without having to change receivers or sacrificing another USB port.