"Microsoft’s new Arc Touch Mouse takes a fairly bold approach to
a portable mouse. Instead of a traditional design sacrificing size for
portability, the mouse is designed to fold flat for transport and bend
upwards to use as a full-size mouse. In addition to a radical form
factor, the mouse offers a touch-sensitive scroll bar and a tiny USB
transmitter/receiver. Having used other portable mice from Microsoft, I
was eager to try out the Arc Touch."