Table microphone 28 dB 100 - 11000 Hz Omnidirectional Wireless Device interface: Bluetooth/3.5 mm 8.5 m Black SUPERIOR SOUND IN LARGE ROOMSExtend the range of the GROUP video conferencing system with Logitech GROUP Expansion Mics. Accommodate up to 20 people in one large room and make sure everyones voice can be heard. Simply plug the microphones into the GROUP speakerphonethey are automatically recognized and configured. An indicator light shows when the microphone is muted, when a call is active, and when Bluetooth wireless pairing has begun. Microphone Noise reduction Yes Microphone mute Yes Microphone direction type Omnidirectional Microphone Total Harmonic Distortion (THD) 1% Microphone frequency 100 - 11000 Hz Microphone sensitivity 28 dB Type Table microphone Ports & interfaces Maximum operating distance 8.5 m Device interface Bluetooth/3.5 mm Connectivity technology Wireless Performance Compatible products Logitech Group Plug and Play Yes Product colour Black Weight & dimensi