Outback Power Systems MATE2 System Controller and Display Installation and User Manual - Manual (Page 26)

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SETUP/MATE/PAGE3--------------
choose category:
PG2 BEEP MAIN
SETUP/MATE/BEEP--------------
button beep tone ON
BACK OFF ON
The <BEEP> soft key leads to a
screen controlling the MATE’s beep
tone, which is made whenever a key
is pressed.
The beep tone refers to a sound made
every time a MATE soft or hot key is
pushed. Press the <ON> or <OFF>
key for this function.