NOVIK NEO VNK-100 Wireless Microphone Using multilevel high frequency and mid frequency narrowband filter, so as to dispel any possible interference signals. Diversity receiver, these transmission system ensure interference-free transmission and minimize dropouts in the RF link, avoid the dead angle. Special designed circuit on the microphone for clearing up waves of miscellaneous signals. With audio compressing-expanding technology, the machine can lower noise an increase the dynamic range. It can also lower re-echo. Using VHF 200-270 MHz band to avert interference frequency.