Suppliers must certify compliance with this specification and provide required documentation (including required test data, Full Material Disclosure (FMD), ...
https://www.apple.com/jp/environment/pdf/Apple_Regulated_Substances_Specification_Sept2018.pdf
Overview 3 Introduction 4 Hearing Test Feature 5 Technical and Feature Description ...........................................................................
https://www.apple.com/jp/health/pdf/Hearing_Health_Features_on_AirPods_Pro_2_October_2024.pdf