| 摘要 |
A portable device includes a light emission unit to emit light on a case, a clocking unit to clock time, an information acquisition unit to acquire information indicating a position and/or a state necessary for illuminating the light emission unit, and a control unit to determine whether to illuminate the light emission unit by using timekeeping information acquired from the clocking unit and the information indicating a position and a state acquired from the information acquisition unit, and to control the light emission unit under either a light emission state or an extinction state from a result of the determination.
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