The 2.4" BOYA BY-K9 is a short adapter cable that converts an analog 3.5mm signal source to a digital USB Type-C output, making it ideal for connecting a shotgun microphone outfitted with a 3.5mm TRRS male output plug directly into the USB Type-C port of a smartphone, tablet, or computer. The BY-K9 features a 3.5mm TRRS female mini jack on one end and a USB Type-C male connector on the other.