It’s all in the headphones. Jon Porter:
The Blackloud AF1 FM headset works by building its FM tuner into an in-line control box, while the cable functions as the antenna. The headphones then plug into your iPhone via the Lightning jack (a USB Type-C model for Android handsets is planned for next year), and you control radio playback via a companion app.
Simple. Elegant. Useful. $80 though.