It runs on 110 volts AC house current, or on batteries that are no longer made. I don’t have a lot of 1nformation on this radio, other than the model numbers (644, 645, 646, 647 etc.) were the same radio with different color. The most popular were gray and white. I added a link to this baby playing because I am simply amazed at the sound quality for an AM radio with no external antennae, that is older than I am.
I love old electronics, and am always buying old crap. If I had room I would have a hundred old radios. Speaking of room, I need to make some. This radio is available for $35, plus shipping and insurance. They are listing on eBay for as much as $80.