If you use a wireless cell phone headset with Audio IQ technology, you may not be aware that there are actually two types of Audio IQ. A pleasant phone call with an effortless wireless connection is the hallmark of Audio IQ. It will adapt itself to noisy background levels while constantly enhancing the volume, clarity and reception quality intelligently. Sound artifacts and distortions are also minimized quite effectively. On the other hand, Audio IQ2 uses 2 microphones. One is focused on your speech while the other singles out potentially disturbing sounds in the background. Audio IQ2 then performs a comparison between the 2 microphones and removes unwelcome sounds. The result is your voice as it should be heard, clear and natural.