Early Learning Centre kids portable CD player.
It has a space for batteries.
In theory you might also be able to run it from mains, if you have the right cable and plug (though we never did it that way).
It was working last time we tried it, a few years ago., but we haven't used it for sometime.
The quality isn't great.
Kids CD Player (North Sheen TW9)
This offer has been gifted to someone and is no longer available.