Uniden XCA650 Instruction Manual page 30

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.
The charge LED will blink
3.
quickly, indicating that the
Digital Code has been reset.
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