Sound becomes low while in use
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The sound may become low in the following cases. This is not a malfunction.
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When the built-in battery is running low and the CHARGE indicator flashes slowly, while the speaker is being powered by the built-in battery only.
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When the built-in battery is running low due to long-term use at a loud volume even though the speaker was connected to a USB AC adaptor (commercially available).
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If the sound becomes low while in use, follow the procedure below.
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Turn off the speaker.
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Charge the built-in battery sufficiently.
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