Contour Perfit Mouse Optical Small

Contour Perfit Mouse Optical Small ... Mouse Optical (PMO) places a scroll wheel above the thumb support, rather than on the top of the mouse to reduce the strain on the index finger, which is already heavily used for the primary mouse click. At the bottom of the integrated Thumb Support is the innovative two-position side rocker switch, which gives quick and effortless access to two additional programmable buttons.