She should:
be small, two side buttons for "front" and "back" have (because it's so convenient), and the radio receiver should be very small, so you can always leave him stuck on the notebook into the USB socket. The whole thing around 20 ....
In the major markets, we found a lot of mice, but none that met all these requirements. Amazon had them. After almost 3 weeks use you can say: Prima running error-free, can sometimes be easily used on the leather sofa when one evening comfortably surf the net.
Recommended!