M-Audio AIR|Hub USB 3-Port Interface - Black

Essentially a giant volume knob that gives you a bunch of extra USB inputs and the ability to control headphones . But most importantly , you will never hover over menus looking for the software audio slider again as the music blares in your face. I use it everyday as part of my work "workflow" of constant teams calls as well as controlling powered monitors for music production. plugged it in and my Mac Air recognized it right away, I selected it as the audio option and off I went. I really love this thing. Solid metal and well made.