The MyMONITOR is connected between the mic and line source, and the mixer. The Mic and line Monitor levels can then be adjusted for mix and volume through the headphones. Only the mic signal will go to the board. And since MyMONITOR can also be battery powered, the unit can be used on a large stage or wherever there is no AC outlet nearby. Dynamic or condenser mics can be used since phantom power would come through the Mic Thru jack from the mixer or other source.