After selecting volume adjustment mode (pressing chime or mic) the corresponding volume
can be adjusted in steps of 3 dB by pressing the ‘+’ and ‘-’ buttons. Once the volume is
adjusted, the current settings can get tested by pressing the ‘test’ (push to talk) button,
whereafter the chime tone will be announced or the microphone will be activated.
After these settings are made correctly, returning to normal operation mode is possible by
pressing both ‘Exit’ buttons (select & clear all) simultaneously.
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