Point Source Audio CO2-8WL-XLE-BL - SERIES8 Omni Dual Element Lavalier Mic (Black / TA5F)CO2 8WL is Two Mics in One Supporting Two Separate Wireless Transmitters. The CO2 8WL is the world's first fully redundant dual element microphone. The lavalier's one of a kind design pairs two microphone elements into a single housing to create a form factor that is ultra low profile. The paired elements are factory matched in frequency and sensitivity so that when vital backup is initiated any difference in audio performance is nearly undetectable.