V2 18FT ATC Radio Audio Recording Cable with Dual Output for Gopro Phone Audio Recorder Extra Long 18ft / 5meter Airplane Cockpit Intercom with USB Power HERO3 / HERO3+ / HERO4, NOT FOR HERO 5 AND UP : Electronics - Amazon.com
Nflightcam GoPro Hero5 Audio Adapter - avworld.ca
NFlightCam Helicopter Intercom Cable for GoPro Hero5/Hero6/Hero7/Hero8/Hero9/Hero10
NFlightCam Aviation Audio+Power Cable for GoPro Hero3, 3+, and 4 – Nflightcam.com