Yamaha Revolabs FLX2 System Manual page 10

pressing the button on the microphone while it is in the
charger. The microphone will start in a muted state. Once it
starts blinking red, unmute it by pressing the mute button once
again. Microphones in the charger base never transmit audio
to the AUX OUT connector. If any microphone is active
outside of the charger base, microphones in the charger base
cannot be activated (unmuted) for the call.
To make a call using the Dialer as a handset, make sure that all Microphones are in the
Charger Base before starting to dial the number. At this point, only the Dialer will be
used for the call. To end the call, press the red hang-up button on the Dialer.
At any time during a call you can toggle between handset and conference phone mode
using the buttons on the Dialer.
To answer a call using the conference phone, simply remove one or more Microphones
from the Charger Base when the Speaker rings. If a microphone is already out of the
charger base when an incoming call comes in, pressing the button on the microphone
will answer the call in conference phone mode. You can also use the Dialer to answer
the call by pressing the green call button on the handset. If all microphones are in the
charger at this time, the call will be answered using the handset mode. If at least one
microphone is switched on and not in the charger base, this will answer the call in
Conference phone mode.
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