3.5mm is an output port, then how does “play/pause” button signal sent to phone?

Question

sorry i meant play pause button of connected earphones.

In: 8

Answer 1

It can be an input, too. If you look at the plug, you’ll see a few bands. From the tip, you have left and right, maybe another for a mic or other controls, and the sheath going to the base for ground.