I work in live sound and radio and must have bought over 20 of these little toolbox treasures over the years. They're a 2 in 2 out USB sound card on drugs, completely USB bus-powered and with additional analogue mixing features to get you out of trouble or work a quirky route without feeling too unclean! They serve as an all in one phantom, pre amp and USB interface to our home-based broadcaster solutions. They are recognised by Windows, Linux, Raspberry PI, Chromebook, MAC, no fuss, no drama, they just work and are incredibly clean and clear in their operation. I've streamed a major radio station to the world on one, recorded some major names through one and bridged a busted rack of mic processing kit using one, they fit the bill for a whole number of things. Even if you don't need one right now, buy one anyway as you'll soon find yourself needing it for something! Thomann have a very similar own brand version too (the MicroMix 2) that I've also bought but not used in anger yet. It has Bluetooth as well so that could be fun!