Bit-Tech has put up a Cordless Trackman Optical review

This is a cordless trackball that uses radio technology to communicate with its receiver over a maximum 2 metre range, (6'). It uses optical sensors, similar to that used in optical mice, for detecting movement of the trackball. Theoretically there are no moving parts to wear out since it is highly unlikely that the ball would wear out during the units life. It has eight buttons including the standard left/right mouse buttons and a scroll wheel. The unit is powered by two AA batteries which have a life expectancy of up to 6 months with normal use.

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