Table 2 Questionnaire items for user evaluation.

After each session

What is the maximum duration you can wear this device (min.)?

10, 20, 30, 60, more than 60 min.

How uncomfortable is this device to wear? (1 ~ 10)

1: Very uncomfortable

10: Not uncomfortable at all

Would you like to wear this device again? (1 ~ 10)

1: I would not want to wear it again at all.

10: I would very much like to wear it again.

Is this device’s design aesthetically pleasing? (1 ~ 10)

1: Not aesthetically pleasing at all

10: Very aesthetically pleasing

Is this device easy to wear? (1 ~ 10)

1: Very difficult to wear

10: Very easy to wear

Do you think most people would easily get accustomed to using this device? (1 ~ 10)

1: Not likely to get accustomed at all

10: Very likely to get accustomed

After the experiment

Please rank Devices A, B, C, D, and E in order of difficulty to wear.

Please rank Devices A, B, C, D, and E in order of discomfort when worn.

Which device do you prefer the most?