Peavey PRO COMM U1002 Operating Manual page 35

ERR no04 - The frequency you are about to program into the system is
below the microphone's frequency lower limit (At this time the
microphone is still operable and the frequency remains
unchanged. To clear the "ERR" message in LCD display,
simply turn off the power and switch back on.).
(2) "GROUP" and "CHANNEL": when both items are shown they indicate
the user is currently using a pre-programmed frequency in the
receiver.
(3) "CHANNEL" Only: lf only the channel number is shown in the display,
it indicates the user is using a personalized frequency.
(4) Battery Status: Indicates the power remaining in the transmitter
battery. When the battery has less than 10% power remaining it must
be replaced or recharged. If under-voltage continues, the LCD will
show "Poff' and the system will shut down to prevent being overly
depleted.
(5) "Poff': When the power switch is turned off, the LCD will show "Poff' first
and then the system will shut down and no further messages will be
displayed.
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