If you are vlogging with an iPhone, in this video you’ll see a test comparing the Edutige EIM-001 vs the iPhone’s built in microphone. The Edutige EIM-001 is a high gain microphone that boosts the input volume of your iPhone’s audio during video recording… and for audio, too. If you want to know how to improve your iPhone’s audio quality, then check out this video and check out the microphone, too.

EIM-001: http://www.edutige.net/shop/external-microphone-for-gopro-hero4-or-dslr-etm-001/