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
Waterproof Microphone for HERO4 Black & Silver | GoPro External Microphones
Amazon.com: Hero 4 Microphone Compatible with GoPro Hero 4 Silver Black White Edition, Hero 3, Canon, Nikon Camcorder DSLR Camera- External Lavalier Lapel Mic : Electronics
Amazon.com : SOONSUN Frame Mount Housing Case with External Lavalier Lapel Clip-on Microphone for GoPro Hero 3, Hero3+, Hero 4 Black White Silver Action Cameras : Electronics