FRS440 CALL alert volume
Hi Duncan,
That is correct, you won't find any solution in the manual, because these are made with pre-set alert tones built-in.
The fact that they are second hand units, you've done well in that they work at all.
Uniden are a well known brand so that would explain the fact they just keep on going, slowly wearing out over time, so enjoy them for as long as they are kicking.
I hope I have answered to your satisfaction.
Regards, Peter
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