This compact microphone preamplifier mixer has two operating modes - Mixed and Discreet. In discreet mode each microphone input is assigned to its own audio output. That is, the left mic input will be discreetly assigned to the left RCA output, while the right mic input will take the right RCA output. In mixed mode the two microphones signals are mixed and the mixed mono signal is directed to both RCA outputs. This device is ideal where space is limited. Operates on 12V DC. Power supply included.