dalars wrote:
Are you saying the headphone jack is also the input?
Yes. This has been a standard almost since the 3.5mm jack was invented.
how do you have both in and out when working?
If you have a headset with mic attached it's automatic. The Mac will detect both, and get audio from the mic, and output audio to the headphones.
If you have just a 3.5mm stand alone mic, you can plug it into it, and it too will work as an input. But you will have to rely on the built in speaker for sound.
You can also have an audio splitter, that combines the stereo audio out and the mic in into a single 3.5mm connector if you have separate headphones / speakers and microphone or other audio input.
You can check out audio settings in System Settings ➜ Sound, Output / Input.
If you need an additional input or output, a USB audio adapter should also work.
click here ➜ Creative Labs Sound Blaster Play! 3 External USB Sound Adapter - Amazon.com
$17.84 at the time of writing this.