. Expand the conversation area so that even those away from the speakerphone can be clearly heard. Microphones are automatically recognized & configured by simply plugging them into the speakerphone Product 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 & 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 & when Bluetooth wireless pairing has begun. What's in the box?. Two expansion microphones