Unnatural postures are a risk factor for development of complaints of wrist and underarm (Karlqvist 1994, Jensen 1998, Hagberg 1994).

When the mouse is positioned closer to the body; the strain of shoulders and neck decreases (Armstrom 1995, Cook 1998).

Productivity is lower when using a trackball and touchpad, standard mice and pen tablets enable a higher productivity.

Ergonomic: eliminates arm twisting by keeping the forearm in a neutral position
Buttons: 2 buttons and separate scroll wheel (third button)
Optical: optical sensor for precise movements
Connection: USB and PS2
Easy to use
Right handed