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| User actions | User psychological demands |
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| A1 Adjust sitting posture | Chair backrest angle is reasonable and the body is relaxed |
| A2 Take out the massager | Easy accessibility and continuity of operation |
| B1 Grab the massager handle | Grip strength, massager grip size and diameter, grip fit of hand and massager, touch, and antislip effect |
| B2 Hold the massager base | Massager is easily taken out with a single hand and available force area of the massager base is sufficient |
| B3 Press the on/off button | Satisfactory controllability, smooth process, easy-to-understand operation, and timely feedback |
| B4 Adjust the massager switch | Timely control, satisfactory controllability, smooth operation, and easy operation |
| B5 Wear the massager | Accurate and controllable massage position and large arm curvature |
| C3 Move the massager | Motion range of wrist, shoulder and elbow joint, support strength, head comfort, and force on head |
| C4 Switch hands | Length of the massager grip matches with the hand, vibration amplitude is controlled, and shoulder and elbow are comfortable |
| D3 Check the display light | Display light corresponds to the state of the massager (i.e., whether the controller stops) |
| D4 Place the massager on its base | Massager can be easily placed on the base |
| E1 Connect the charging cable | Tidiness of the table, compatibility of the charging port, and handleability |
| E2 Press the base of the massager | Steadiness of the massager |
| E3 Plug in charging cable | Easy to operate, charging port is easily seen, and accessible |
| E4 Check the display light | Recognition, logical clarity, and timeliness of information |
| F4 Replace the massager | Charging cable is easy to organize and store |
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