Sony WIC400/L Help Manual page 66

Hint
The default setting of the vibration function for receiving a call is "on."
To turn off the function, press and hold both the
will hear a voice guidance which informs the switching of the function and the
To turn on the function again, press and hold both the
You will hear a voice guidance which informs the switching of the function and the unit of the headset vibrates for about 1 second.
Some smartphones or mobile phones by default receive calls with the phone instead of the headset. With an HFP or HSP
connection, switch the call device to the headset by holding the
or mobile phone.
Volume for a call can be adjusted during a telephone conversation only.
Volume during a call and volume during music playback can be adjusted independently. Changing the call volume does not
change the volume of music playback, and vice versa.
Note
Depending on the smartphone or mobile phone, playback may not resume automatically even if you finish the call.
Use a smartphone or mobile phone at least 50 cm(19 3/4 in.) away from the headset. Noise may result if the headset and the
smartphone or mobile phone are too close.
Your voice is heard from the headset through the headset's microphone (Sidetone function). In this case, the surround sound or
sound of the headset operation may be heard through the headset - this is not a malfunction.
Related Topic
About voice guidance
How to make a wireless connection to BLUETOOTH devices
Making a call
Functions for a phone call
button and -/
button and +/
button down for about 2 seconds or by using your smartphone
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button for about 2 seconds while the headset is on. You
left unit of the headset vibrates twice briefly.
button for about 2 seconds while the headset is on.