Auxiliary microphones for larger groups. Extend the range of the GROUP video conferencing system with Logitech GROUP auxiliary microphones. Hold conferences with up to 20 participants in one room and ensure that every participant can be heard clearly. Simply connect the microphones to the GROUP speakerphone. They are automatically detected and configured. The indicator light shows when the microphone... is muted, when a call is active and when Bluetooth® wireless pairing has started.