The first photo made me think it’s a pair of loud speakers. The second photo made me think it’s an old battery!

I used to see a power converter at home when I was a child. My father got a big fridge from an American friend. That fridge used 220watt electricity but at that time we used 110watts in Thailand. So, the fridge had a converter which was a small square box but it didn’t have a round hole in front.
That fridge and converter were alive till I grew up which was about twenty years! I just realized how long they lived with us!

Cheers!