I say a unique. Yes, it’s a unique device from Microsoft. The unique is not only its design but also its operational. To turn the mouse on you need to arc its form and flatted to turn off. And for scrolling, you just need to click, tap, flick, and control. It’s a new innovation, and dandy.
Compacted in 58mm(wide) and 130.6mm (long), Microsoft didn’t tell us about its price tag. Maybe you can ask Microsoft about Arc Touch mouse at CES 2011 (ask also their tablet PC). [Dandy Gadget Source]