The optical sensors were an improvement on mice with ball. But optical technology has been outdated.

Now is MX1000, the first laser mouse, with a performance that no optical mouse can emulate. With an incredible sensitivity to the surface details (tracking capability) 20 times higher than that of the optical technology, the laser can track reliably even on surfaces or polished wood.

Rechargeable
The base station fast loading ensures the availability of a mouse at all times, and there is no need to change the lithium ion battery.

Fast RF wireless technology
With a yield equal to that of wired USB connections.