HumanTechnik signolux Bedienungsanleitung Seite 54

test button once again. Up to 8 transmitters can be assigned to a
single alarm symbol.
Testing function
By pressing either the module's test button or the detector's exterior
test button, the detector's function can be tested. With this test, an
alarm signal is sent to all signolux-receivers previously registered to
this detector.
Battery status
The smoke detector has two fixed batteries: One for the detector
itself and one for powering the module. Should any one of these
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Test button
Battery status
indicator