The front panel consists of Power LED, which lights up when you have Schiit Modi 3E plugged into a computer or an external power source. It also comprises the Input Selector switch, which allows you to toggle and switch between inputs. When it is at the top, Unison USB input is enabled. Coaxial input is enabled when it is at the bottom, and Optical (Toslink) input is enabled when it is in the middle. The rear panel consists of RCA Analog Outputs, Coaxial Digital Input, Optical Digital Input, USB Data and Power Input, and Power Input.