Section 874.3302 - Bone-conduction hearing aid(a)Identification. A bone-conduction hearing aid is a wearable sound-amplifying device intended to compensate for impaired hearing and that conducts sound to the inner ear through the skull. The non-implantable components of a bone-conduction hearing aid, such as the external sound processor, are subject to the requirements in § 801.422 of this chapter.(b)Classification. Class II. 87 FR 50762 , Aug. 17, 2022