Uniden XCAI680 User Manual page 27

If the Base Unit loses power while the Handset is off the Base, the Digital Code may be erased.
When this happens, the Handset will not function. To reestablish communication between the
Handset and Base Unit:
1. Restore power to the Base Unit.
2. Place the Handset back on the Base Unit.
3. The Battery icon will blink to indicate that the Digital
Security Code is set.
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