Belkin PUREAV AVU1500 Guide D'utilisation page 16

Features | Front Panel
19. Audible Alert ON / OFF – this unit can sound an audible alert to
inform you of a power outage. This display indicates if the audible
alert feature is turned ON or OFF. The alert sound can also be
temporarily muted during a real power outage by pressing the
"Audible Alert" button. This will cause the "Audible Alert" ON text
to blink.
20. Override ON / OFF – in the event of a power outage, this unit
provides battery backup. To extend the battery's ability to supply
power to your most critical home theater equipment, power can be
automatically shut off to your less critical devices first. This display
indicates if this staged shutdown feature is being overridden (i.e.,
"Override ON" = stage shutdown off).
21
23
25
13
28
26 27
22
24