Doro MemoryPlus 309dp Mode D'emploi page 10

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Battery
MemoryPlus 309dp has a built-in battery that saves stored
telephone numbers for at least 6 months if the device is
disconnected from the telecom network.
When the device is connected to the telecom network the
battery's average lifespan is 3 years.
Before using for the first time
Protective tape prevents the battery from discharging while
the device is in its packaging. Remove the protective tape
by pulling the flap that protrudes by the battery cover before
you connect MemoryPlus 309dp.
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