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Use the channel selector to change the transmitter's
transmission frequency. Then you will need to adjust the
tuning control by press the “Auto Scan” button on the
headphones.
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The headphones battery charge level may be too low. Recharge
the batteries or replace them with fully charged batteries.
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Ensure that the volume knob setting is correct.
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The headphones may be too far away from the transmitter.
Move closer to it.
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The audio signal input level is too low. Increase the volume
from the audio source of Hi-Fi, CD, or TV, etc.
