From 1981, I can't read it, did they make the boombox? It looks like an ad for a music club with a free boombox.
I have a translate on my IPad but I cannot copy and paste it to show you . However it is the Music Club which is offering the boombox for sale at a reasonable price and the second paragraph describes its features.
Nice! I was wondering what the brackets on the side were for, their for microphones. I love this style boombox, kind of reminds me of the little JVCs of the time.