Our MC880 series of features simple operation and high flexibility.This system can be connected to multiple devices. For this wireless conference system, there is no need to connect the conference units.This system can be quickly installed without trouble some arrangment. There are 999 unit (include chairman unit)of microphones in one system,among which 5peopel can be speak at the same time. The digital wireless conference system supports the rotation,limit and chariman only model. The system working state can be show on the main unit of LCD. The conference system has auto-tracking function for connect the video processor. Communication:UHF Channels: 5(include 1 chairman and 4 delegate) Frequency range: 500MHz - 950MHz Modulation model:FM Receiving sensitivity:-100dbm Signal coverage:Indoor 60 meters radius Audio frequency response:50Hz-15KHz Signal to noise ratio:>85db Total harmonic distortion of audio:â?¦0.8% Power input:DC12=15V,â?§1A Power consumption: