3.5mm Audio AUX Jack to USB 2.0 Type A Female OTG Converter Adapter

3.5mm AUX to USB Female OTG Adapter Cable – MP3 Music Playback (Car Audio). 1 × 3.5mm Male to USB Female OTG Adapter Cable. Designed for select car audio systems, this cable lets you play MP3 files directly from your USB flash drive through your car’s AUX port.

eBay