Huawei Mate 20 & Mate 20 Pro cases confirm no 3.5mm headphone jack - PhoneArena
The Mate 20 & Mate 20 Pro Review: Kirin 980 Powering Two Contrasting Devices
Amazon.com: AXFEE USB C to 3.5mm Jack Compatible with Samsung Galaxy S22 S21 S20 Ultra Note 20, Huawei Mate 40/P30, Xiaomi, Type C Headphone Adapter, Aux Digital Audio Earphone Adaptor, Angled Hi-Res