. Expand the conversation area so that even those away from the speakerphone can be clearly heard. Microphones are automatically recognized and configured by simply plugging them into the speakerphoneProduct Features HEAR CLEARLY UP TO 28 FEETGROUP Expansion Mics feature a voice pickup range up to 28 feet (8.5 meters) so everyone\'s voice can be heard. Simply plug the microphones into the GROUP speakerphone-they are automatically recognized and configured. EASILY MUTE CALLSA microphone mute button lets those at the far end of the table mute the entire speakerphone system. The indicator light shows when the microphone is muted when a call is active and when Bluetooth wireless pairing has begun. What\'s in the box? . Two expansion microphones