With the PLUS and MINUS buttons, you can now switch between the
different EHS types.
To confirm the EHS has successfully installed, the headset automatically
switches back to charge mode after approx. 10 seconds.
Base setup:
Set the phone set-up switch to "A".
Microphone level setup:
Please call someone with the headset.
You must now simultaneously press the PLUS and MINUS buttons on
the headset which immediately produces a signal tone.
https://www.jabra.co.uk/supportpages/jabra-gn9120/9120-281-11/faq/0f2a5ee5-
8734-473b-81b6-0b593baaaa41
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