The Sound Devices 302 features 3 balanced XLR inputs that are capable of accepting mic or line-level signal (user switchable). The output stage features stereo (L/R) balanced XLR outputs that are also mic or line level switchable (factory set to line, refer to manual for mic level set up). Each channel provides individually switchable +48V, +12V and +12V-T phantom power for condenser microphones. Channels 1 and 2 are stereo linkable and a polarity (phase) reverse switch is provided on channel 2. The unit is powered by 3 AA batteries or external 5 – 18VDC power source.