You cannot establish a Bluetooth connection.
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Your IC recorder is turned off. Turn on the IC recorder and the smartphone, and then make sure that the Bluetooth function is turned on.
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The battery of your IC recorder is running low or almost out of power. Charge the battery with a running computer or a USB AC adaptor (not supplied).
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The Bluetooth pairing information on your IC recorder or the smartphone is deleted due to initialization (settings, internal memory, etc.). Establish a Bluetooth pairing all over again.
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Your IC recorder and the smartphone are too apart from each other. When they are apart from each other, you may not be able to establish a Bluetooth connection or may lose the connection. Use them in a close vicinity.