GE twin set 21880 - Manual (Page 39)

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No display. The battery has not
been charged. Charge the battery or
replace them (see
Battery Charging)
No reactions to
keystroke.
No radio connection
to the base station:
blinking! The keypad is locked.
The handset is outside
the base station range.
The handset is not
registered.
The base station does
not work. Press * key longer
than 2 seconds.
Move closer to the
base station.
Register the handset
(see Registering
Handset).
Unplug and then plug
the power adaptor to
the power outlet
(220-230V AC / 50
Hz)and the other end
into the power jack on
base bottom.