Eli5: why do wired headphones that plug into your phone never need to be charged but wireless ones do?

Question

I thought maybe they got power from the phone but then I remembered old headphones plugged into a phone jack separate from the charging port so how come one type never needs to be charged and one does?

In: 0

Answer 1

Same for computer speakers. Used to have some that just needed the 3.5mm audio jack. Others need usb. And the powerful ones need to be plugged into the wall.