In the review I will try to avoid technical terms, so that it is usable by as many people as possible. It is an audio interface with a USB C socket. You have two physical inputs and two physical outputs, which communicate with the computer (PC or Mac) via USB. Basically you can play any mix of the sound coming from the computer and the sounds coming from the two inputs from the two line outs. There is a headphone output where the output sound is replicated. This bundle is lot worth as it helped me save on the extra accessories... which are much needed.