Usability evaluation of wireless device can find improvement about user convenience. This study investigated natural finger pressure range when presses touch sensor. Fifteen adults (Male: 10, Female: 5, Age: 26.13 ± 3.98 years) were recruited in this experiment. Subjects carried out a usability evaluation about wireless device operation. The usability evaluation measured finger pressure on touch sensor operation of wireless device using finger pressure sensor. Subjects performed 1.76±0.95 times until pressing the touch sensor to complete task (t = 3.091, p = 0.008). In comparisons between natural movement and the movement to complete task, more finger pressure value was decreased in natural movement than the movement to complete task (t = -2.277, p = 0.039). This study found a finger pressure values to improve effectiveness of wireless device operation interface. Finger pressure value was presented to induce natural movement for the use of touch sensor.
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