The black Microsoft Arc Touch Mouse is a unique mouse that features a flexible design. Rather than a button to turn it on and off, you simply curve to turn it on, and flatten to turn it off when you're done using it. Touch scrolling allows for intuitive navigation. Thanks to Logitech's BlueTrack technology, the mouse is able to be used on virtually any surface. Plus, the USB nano transceiver plugs into your computer and stays there. Or attach it magnetically in the mouse for safe keeping.