Uniden TXC400 Owner's Manual page 26

During a call, as you begin to move your handset too far from your base unit, noise
increases. If you pass the range limits of the base unit, your call will terminate
within 30 seconds.
If you encounter interference while using your phone, you can manually change
the phone's channel for clear operation. This function works only when the phone
is in use.
Press . "
SELECT/CH
changing to another channel. For more information on interference, refer to
"Radio Interference" on page 50.
To locate the handset, press
beeps for 60 seconds, and "
Paging is canceled when pressing any key on the handset or
on the base. Additionally, if you receive an incoming
PAGE
call, page is canceled.
" appears on the display, indicating the phone is
on the base. The handset
PAGE
" appears on the display.
If the handset battery is
completely drained, the
handset will not beep
when paging.
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