Surface Dial - Available at antonline.com

Transition seamlessly through tasks
Press and hold Surface Dial to display a radial menu of tools, making it easier and faster to do the things you love your way, while supporting your workflow.
Make everyday tasks simple and fun. Adjust the volume on your favorite Groove track. Scroll through news articles without touching your keyboard or mouse. Fly through your local city in Windows Maps.
Now available at antonline:
www.antonline....
Source video: Microsoft