AT&T CL2939 - Manual (Page 3)

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Battery installation (purchased separately)
You can use this telephone without batteries installed. If you do so, the
telephone works only to make and answer calls with the handset, adjust
volume (ringer or handset volume) or use the last number redial feature.
NOTES:
Use disposable alkaline AA batteries only. Do not use rechargeable batteries.
If you do not use the telephone for a long time, disconnect and remove the
batteries from the telephone to prevent possible leakage.
Always unplug the telephone line cord before installing new batteries.
After you replace the batteries with new ones, the clock in the telephone
resets. Manually set the clock again.
If there are no batteries installed and the telephone is plugged into a
telephone wall jack, when you lift the handset the screen display works
using the power from the telephone line. For more details about the line
power, contact your telephone service provider. •
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Rotate the bracket and lock it back as shown below. .