Motorola MD7090 ユーザーズマニュアル

Four AA alkaline batteries (not included) can be 
installed into the base as backup in case of a 
power outage.

Note: The corded handset will work during power 
outages with or without the backup batteries.

With the back of the base facing you, press the 
cover latch to remove the battery compartment 
cover.

Insert four AA alkaline batteries as directed on 
the compartment.

Replace the compartment cover by inserting the 
tabs of the cover into the slots on the base unit. 
Press down until the cover clicks into place.