My mouse is raido comuication to the reciver then cable to the computer. It just uses a light beem to detect the movement of the mouse insted of the coventional ball and weels. it has a light beem and a sensor.
This means no cleaning the crud out of the mouse ever again.
The key board is raido link as well.
Battries last about 2 months depending on use.
Boath have exelent feel to them its £100gbp well spent.