For tasks involving frequent use of buttons on a computer input device, the activation force of the buttons should be in the range between a minimum of 0.25 N (0.9 ounces) and a maximum of 1.5 N (5.4 ounces), and the displacement of the buttons should be in the range between 1.0 mm (0.04 in.) and
6.0 mm (0.24 in.).
Additional Information: Such buttons should support the resting weight of the thumb or finger so as to minimize accidental activation or the need to suspend the thumb or finger over the button for long periods.100