When the mains goes, the battery takes over. If the battery is swollen I replace it. I do not bridge the circuit. The test button is once a month, not every day.
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Acil aydınlatma
When the mains goes, the battery takes over.
Questions
Is this page that company's catalog?
No. I describe the families I meet on site. The order code is read off the label. The price is written after measurement.