The HANDSHAKE Mouse has a vertical grip, two buttons and a scroll wheel. Proper use of this mouse lowers muscle tension.
The HANDSHAKE Mouse is suitable for medium and small hands (hand widths up to 9 cm, not including the thumb).
If your hands are wider, the Evoluent mouse is a better fit. The HANDSHAKE Mouse has a powerful laser sensor and can be adjusted to 400/1600/3200 DPI.