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Specification  Wireless Transmission : Digital 2.4GHz Built-in Microphone : Polar Pattern: Omnidirectional ; Frequency Range: 50Hz-20kHz Sensitivity : -32dB±15dB @ 1KHz Operation Range : 250m (820ft) (Line of Sight) Signal-to-Noise Ratio : >80dB Maximum SPL : 110dB S..