One of the things that was lost when Apple lost weight a few years ago iMac were the ports and is that the number of ports available in the new version of these computers decreased by focusing solely on, sound wise, into a headphone audio output.
For this reason, a user who had a headset with a built-in mic was helpless by Apple having to buy new headphones with a mic that were connected via USB to be able to record the audio input.
For Aukey He has thought about it and created an adapter to connect it to a rear USB port on the iMac and convert it into a mic input and an audio output for headphones. As you can see, it is a very simple option that when you connect it to the back of the iMac, it manages to have the two ports that we are talking about on the front of the computer.
It is made of resistant white plastic and specially designed for 21,5 '' or 27 '' iMac computers and its shape reminds other adapters on the market to be able to have different USB ports on the front of the iMac.
Using it is as simple as connect it to a USB port on the iMac and thanks to the shape of the adapter, it will pass under the screen leaving the 2 headphone and microphone jacks fully accessible at the front. You can get on this website, although at the moment they do not have it available so you will have to wait for the stock to be replenished.
The manufacturer no longer has it available but if you browse the net in search of it, if you need it, you can get it in the remains of stock that some suppliers have both online and in physical stores. I have been able to get it in a Reseller that had unsold stock of it.