amazon basics B00UG9HB1Q Bedienungsanleitung Seite 6

EN
4. Open the battery compartment (B) and insert 4 x AA batteries (not included).
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NOTICE
When the batteries run out, the icon will turn on. Replace the batteries
then.
NOTICE
In the event of battery failure, connect a suitable external power source
(5 V ) to the backup supply socket (D) for supplying power to the safe.
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6
B
D