1/4" jack would be ideal, 3.5mm would be second best, and bluetooth would be okay.

Im more worried about sound quality and how portable they are. They can either be rechargeable battery (preferred) or not take a lot of power draw (not sure how speakers work maybe this is unreasonable) so I can use it with a power station battery thing.

I found this:

Kove Audio Commuter 2

But thats about it. Anyone have a good idea / recommendation?