Extra control right where you need it Two customizable thumb buttons make it simpler & faster to get things done. A new, more powerful scroll wheel The new Dual-Axis wheel gives you instant access to the App Switcher & Charms Bar. Our smallest receiver ever Just 3 mm long, our plug-&-forget pico receiver practically disappears in your computer’s USB (Universal Serial Bus) port. Work & play longer You’ll 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 it’s simpler & faster to get things done. They come programmed for Windows 8 Start screen & 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 & App Switcher, so you can experience new Windows 8 navigation—effortlessly & confidently. Plug-&-forget pico receiver Just 3 mm long, our smallest-ever wireless receiver practically disappears in your computer’s USB (Universal Serial Bus) port. Since there’s no need to unplug it when you move around, it’s ideal for portable computers like laptops & Ultrabook™ devices. Unifying-ready Connect up to 6 Unifying-compatible devices to the same receiver. Add a keyboard, switch between mice, mix & match to fit your lifestyle. All without having to change receivers or sacrificing another USB (Universal Serial Bus) port.