Is the 3.5 mm headphone jack of a Macbook Pro Retina also a line in port?

Question

The question is in the title of the post. :)

The Apple website says:

3.5 mm headphone jack

• Support for Apple iPhone headset with remote and microphone
• Support for audio line out (digital/analog)

Does this mean that the port is also a line in for the microphone?

Answer 1

Yes, you can use the port as a line in. As detailed in Apple's support article,

1. Plug the input audio device into the combination audio port using the proper adapter cable.
2. From the Apple () menu, choose System Preferences.
3. Choose Sound from the View menu.
4. Click the Input tab.
5. Change the "Use audio for:" menu selection from Sound Output to the Sound Input.
6. The device type should change from "Internal Microphone/Built-in Input" to "Line In/Built-in Input."