| 摘要 |
PURPOSE: An ear-attachable sensor set and an operation method thereof are provided to obtain head motion information by using an acceleration sensor. CONSTITUTION: An external body(410) includes a depressed part(430). An ear is inserted in the depressed part. The external body is combined with the ear through the depressed part. A first biometric electrode(461a) is installed in the external body. The first biometric electrode is arranged in a temporal part. At least one biometric electrode is arranged around the ear. [Reference numerals] (AA) Ear
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