HumanTechnik lisa Bedienungsanleitung Seite 53

test button
EN
channel selector
battery depletion indicator
Battery depletion indicator
If the »battery depletion indicator« lights up constantly, this means
that the built-in battery is almost fully discharged.
The »RF smoke detector« must then be replaced. The »battery de-
pletion indicator« might flash briefly in the transmission mode; this
does not indicate that the battery is low.
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