Amateur radio? Stereo microphone amplifier?

For amateur radio transceiver
Booster?
Receiving booster?
Stereo microphone amplifier?

I don't really know (lol)

13.8V
SP1
SP2
15W+15W
Speakers sold separately
¥22,000
As listed

New and unused, but no guarantee!

This is a very old product, so its functionality is unknown!

Please purchase only if you understand this!