Singers typically wear in-ear monitors in their ears during live performances or while recording vocals in a studio. An in-ear monitor allows a singer to hear a custom mix of vocals and instrumentation with less ambient noise.
A singer gets an in-ear monitor custom-fitted for his ear for improved comfort and better ambient noise reduction. The in-ear monitor is attached to a receiver that is either wired or wireless. The singer also wears a transmitter and receiver pack to adjust the mix. The singer works with a sound engineer to determine the mix that is sent to the in-ear monitor and fine-tunes it to allow the singer to focus on his own vocal performance instead of straining to hear himself over everything else.