Connect a professional XLR microphone to the headset jack of the iPhone, iPad, iPod touch, or other compatible smart phones. Provides separate headphone output for monitoring the playback levels of the recording, use will recording on 1st Video or VC Audio Pro. Our XLR Adapter includes a pre-amp that provides a Flat, 6.1dB Gain, from 20Hz to 20,000Hz. It is powered completely by the iPhone headset jack circuitry.