Mini USB to 3.5mm Microphone Mic Adapter Transfer Cable Wire for GoPro Hero 3 3+ 4 Microphone Adapter Cable Digital Camera Cable - AliExpress
GoPro - Mic Stand Mount - GoPro Accessories - Avvenice
Amazon.com: Movo GM100 Clip-on Lavalier Microphone for Compatible with GoPro HERO3, HERO3+ and HERO4 Black, White and Silver Editions - Includes Mic Adapter for Go Pro