Some modification of mouse.
Seamingly, modern manipulators of the type "mouse" reached the tops of its development, however to them will not impediment some improvements.
One of them - an increase lifetime "landing gear" with simultaneous relief of their slide on surfaces.
This not difficult obtain, fuse in instead of staff supporting platform balls from bearing or pneumatic gun.
More complex, but also useful modification - a change original microswitch on more time-proof and sensitive contact.
Strangely that producers to computer periphery hitherto have not made anything like.
However, manufacturers of electro instrument also show short-sight, for example, avoiding install the indicator of the presenting the power supply on their own instruments.