Yamaha Revolabs FLX2 System Manual page 44

Aux Audio
'Aux Audio' is to control the AUX In and AUX Out
connections on the base.
1.
Aux In ON/OFF and Aux Out ON/OFF allow
enabling / disabling the Aux connectors of
the FLX phone.
2.
Aux In Level allows changing the level of
the Aux In signal.
3. Aux Out Level allows changing the level of
the Aux Out signal.
4.
Aux Out – MIC / LINE allows setting the
level of the Aux Out connectors to either
Mic level or Line level.
RF Power
The RF Power level setting allows changing the signal
strength of the base station and microphones. Factory
default is HIGH. Low can be selected to reduce the
signal strength. Lower signal strength reduces the
maximum distance between base station and any of the
wireless devices. A lower setting might be desirable in
environments where a lot of DECT traffic is encountered.
1. Browse to the RF Power menu: Setup 
Advanced Setup RF Power.
2. The user can adjust the RF Power between high
and low.
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