I see Paul answering everybody else's queries and came across this, him asking a question. So I must answer.
By the way its my first post.
The TS-850 is a multi band, multi mode Ham radio transceiver.
There is an optional VS-2 voice announcement board available for it but it would now no longer be in production, so it looks like a Teensy has been used instead.
If some one were putting a voice announcer on that radio it would mostly be for use by blind radio operators.
On request it would announce the current HF frequency that is in use and shown on the units display, it may also be used to announce settings of some other controls for example AM/SSB/FM.
Ham radio is a popular hobby for vision impaired people, I know a few.