Core Features: Built-in 8 microphone arrays Frequency response: 100Hz-16KHz Sensitivity: -45dB 1dB @ 1KHz (0dB = 1V/Pa) Signal to noise ratio: 60dBA @ 1KHz Max sound pressure level: 100dB SPL @ 1KHz THD<1% 360-degree voice pickup Optima HD voice Dual-color LED indicator Up to 8 units can be used in one system. This product ships in approximately 1 days