Technical device producing sound waves, which is placed in the ears, used by the interpreter to receive sound information such as the voice of a speaker that should be interpreted. The device can isolate the interpreter from ambient noise.
Jiménez Ivars, Amparo. Variedades de interpretación: modalidades y tipos. Hermeneus: Revista de la Facultad de Traducción e Interpretación de Soria, 2002, N.4, pags.95-114. Ediciones Universidad de Valladolid.