Fully tested, Griffin iMac. The iMic from Griffin Technology lets Mac and PC users add stereo audio input and output to USB equipped computers, even when they lack audio in or out ports. The interface allows the connection of microphones and other input devices to an iBook, PowerBook, PowerMac, or other Mac and PC systems, with support for both microphone and line level inputs.

1 x 1/8" (3.5 mm) TRS stereo mini microphone/line input (switchable)
1 x 1/8" (3.5 mm) TRS stereo mini line output
Connects via USB A.

Requires Mac OS X and a built in USB port. Tested on MacOS 12 (Monterey)