After submitting his mini review of the RS Model 2000669, SWLing Post reader, Mike, writes:

Attached [above] is an annotated photo of the RS radio’s PC board.

As you’ll see, there is a mystery “blob” chip, which probably handles the DSP functions.

The TDA2922 is an audio amplifier, but I couldn’t find data sheets for the other ICs. Maybe some of your readers can help.

There is one pad prepared for an additional chip, so additional functions might be possible. By the way, I discovered that if you remove the batteries, the memories and clock have to be reset; which is unfortunate. Overall, for $30, I’m quite happy.