(interruptible feedback) on-camera talent are sometimes observed wearing a small IFB earpiece while doing a live remote broadcast. The IFB is a small earphone used by talent which plays back program audio. It also allows the producer in a control room to talk directly to the talent, either in the studio or on location during the transmission.
Interruptible Feedback Line allows producer, director, talent, etc. communicate with each other during a program.
A small earpiece worn by talent that carries program sound or (when interrupted) instructions from a director.