For those of a certain age (I guess).... Its a radio player with speakers. Usually battery powered. Usually with a cassette tape or two (for copying). They ended up getting pretty big in the 80s (large in size) with detachable speakers.
We had the small yellow waterproof, sony sport model.[1]
I think one even had a record player.
At some point loud portable stereos migrated into cars.
Now we just transmit audio to portable battery powered bluetooth speakers
Car stereos became an aftermarket industry with upgrade-able and louder components at the same time that boomboxes appeared on the American market; they were parallel industries, driven by the advent of cheap transistor-based amplifiers in the mid-70s.
We had the small yellow waterproof, sony sport model.[1]
I think one even had a record player.
At some point loud portable stereos migrated into cars.
Now we just transmit audio to portable battery powered bluetooth speakers
images:
Sony sport boombox https://www.flickr.com/photos/55910525@N07/16532295849
google image search https://www.google.com/search?q=boombox+80s&source=lnms&tbm=...
vector stock: https://www.vectorstock.com/royalty-free-vector/vintage-cass...