Geemarc CL330 Notice D'utilisation page 10

INSTALLATION
Note: Mains power is required to power the multifunction features
of the telephone. Fit 4 x AA sized batteries in order to save and
use stored numbers in case of mains power failure. Without mains
or battery power, the telephone can still be used to answer calls or
to manually dial out calls but all the multifunction features will not
be available. If no batteries are inserted, the low battery icon will
be displayed on the LCD display.
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