The BOYA BY-K7 is an adapter cable that allows you to use any battery-powered microphone with your DJI Osmo Action Camera. The short cable features a female 3.5mm TRS connector for the mic on one end, and a male USB Type-C connector on the other end for the camera. Packing List: 1x BOYA BY-K7 Female 3.5mm TRS to Male USB Type-C Adapter Cable for DJI Osmo Action Camera