Kensington Expert Optical Mouse

Trackballs are especially good for those who find it difficult to grip a mouse and click at the same time and the optical mechanism means that this mouse needs much less cleaning. The four buttons are all programmable using the MouseWorks software included with the product. The unique scroll ring is a real bonus for those who work with long documents and the rubber grip on the ring makes this very easy to use with your thumb. People who have RSI or similar musculo-skeletal problems can benefit from alternating between an ordinary mouse and the trackball as a means of reducing repetition. The detachable wrist rest provides added comfortand makes this a more ergonomic mouse for both left and right handed users.