Shure X2u XLR to USB Microphone Signal Adapter and SM57 Microphone Bundle - Manual (Page 17)

17
A XLR Connector
B Tri-color peak level indicator: Green = signal, Yellow = peak, Red = clipping
C MIC GAIN: Adjusts microphone input level before the analog to digital
conversion.
D Headphone jack: For zero-latency direct monitoring.
E VOLUME: Adjusts headphone volume.
F MONITOR: Blends pre-recorded playback from the computer with live
audio from the microphone.
G +48V: Phantom power switch for condenser microphones. Switch off for
microphones that do not require phantom power (conserves battery life
when connected to a laptop).
H Orange phantom power indicator
I USB: Illuminates green when properly connected to a powered computer
USB port.
J USB Connector: Digital audio interface