For the actual configuration:
* Install 2 AAA batteries in the P2.
* Connect the P2’s locking XLR/TRS input to the monitor output of your mixer or audio interface.
* Set the internal switch to Mono if you’re using a single aux/monitor output, or Stereo if you’re feeding it a stereo headphone signal with the correct cable.
* Plug your in-ear monitors into the 3.5 mm headphone output and adjust the volume.