This part of the norm establishes the requirement in the construction field, conception and performance, the test methods and the instructions marks concerning the auriculars, as well as the information destined to the auriculars use when this are mounted in protection helmets to the industry. It determines the provision of the information due to the auricular acoustic mitigation characteristics, measures in conformity with the EN 24869-1:1992, an defines a minimum level of necessary mitigation to determine the respective conformity with this specification.