The buttons function description as follows:
Mode function button; FM / USB / playing
(Long press this button to forcibly turn on / off the machine)
Previous song (long press to increase volume)
Mp3 loop playback function button; (with Repeat One / Repeat ALL /
Random / Repeat Folder mode.)
Play / Pause (long press this button in FM mode to receive the station)
Next song (long press to decrease volume)
MONOROR: Monitor volume adjustment.
EMC MIC: PPT microphone volume adjustment.
TREBLE: Treble adjustment.
BASS:: Bass adjustment.
ENERGENCY: emergency broadcast button, press to select ALERT MSG or
EVAC MSG to broadcast emergency voice message, EVAC MSG is prior to ALERT
MSG, then press ENERGENCY button,to close the broadcast.
ACK/RESET: machine fault alarm reset button.
ALERT MSG: Play emergency evacuation voice.
EVAC MSG: Play fire alarm alert voice.
MONITOR :buttons to switch on and off monitor.
MIC / LINE INPUTS: button to select or switch the source.
ALL ZONE: button to select open or close all zone.
Indicator: Indicates current zone status
1. Orange: fault
2. Green: normal
Zone switch button: switch on or off the zone .
Volume adjustment button: 6 grades volume adjustment knob.