My old unit picked up after a power failure, the time from the time signal transmitter, although again, the clock programming, however, was deleted. When CR25 flash in this case as first zeros, then logs after a while but the display, including alarm time back - the Security secondary bell I no longer need.
The sound clarity is ideal for this little device. The volume setting has been limited so that the Lautsprecherchen is not overridden. DAB I "took" from a technical curiosity, there are no differences to FM audible, the FM transmitter around come in as noise-free.
But I prefer to be awakened gently and only up to the news, to me helps the CR25 yet completely reliable.