Its hard this is the one I ended up going with http://www.amazon.com/Polar-Pro-Promic-Microphone-GoPro/dp/B00MFVO9L8/ref=sr_1_5?s=photo&ie=UTF8&qid=1456874646&sr=1-5&keywords=gopro+mic
over this http://www.amazon.com/Rode-VMGO-Lightweight-Microphone-Super-Cardio/dp/B00GQDORA4/ref=sr_1_8?s=photo&ie=UTF8&qid=1456874683&sr=1-8&keywords=gopro+mic