Fomito Mini USB Male to 3.5mm Jack Female Audio Cable Cord for Active Clip Mic Microphone Adapter for GoPro Hero 1 2 3+ 4 Sports Camera 9.5cm Length Black This great little adaptor allows you to use your favourite headphones or earphones with your mobile phone Simply plug in the cable into your mobile's Mini USB port and then connect your headphones and enjoy high quality sound and listen to your favourite MP3's. Use this mic adapter to connect any external 3.5mm microphone to your HERO 4 camera Mini USB to 3.5mm Headphone Jack for Mobile Phone Simple Plug and Play