Optional Backup Battery Installation - AT&T ML17939 User Manual

Two-line corded telephone/ answering system with caller id/call waiting

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Getting started

Optional backup battery installation

Install three AA alkaline batteries (purchased separately) to use this telephone

in the event of a power failure. If power fails with working batteries installed,

all functions work properly except for the display illumination.

If power fails and no batteries are installed, you can make or answer calls on

line 1 using only the handset. Last number redial and speed dialing are also

supported, but the screen display will be dimmer than usual.

Install the batteries, as shown below:

Press the tab and pull to remove the battery compartment cover. Insert

three AA alkaline batteries (purchased separately) following the polarity

markings in the battery compartment.

Replace the battery compartment cover.

NOTE: If no backup batteries are installed and the power adapter is connected,

steady on the screen.

appears

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