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Phone calls
The caller’s voice cannot be heard.
Check that both the headset and the BLUETOOTH smartphone or mobile phone are turned on.
Check the connection between the headset and the BLUETOOTH smartphone or mobile phone. Use the smartphone or mobile phone and make a BLUETOOTH connection (HFP or HSP) again.
Check that output of the BLUETOOTH smartphone or mobile phone is set for the headset.
Check that the volume of the headset is not set too low.
Turn up the volume on the BLUETOOTH smartphone or mobile phone if necessary.
If you are listening to music using the headset, stop playback, press the 
POWER button and talk.
Low sound from the caller
Turn up the volume of the headset.
Turn up the volume on the BLUETOOTH smartphone or mobile phone if necessary.
