AVer VC520 Pro Expansion Speakerphone offers you easy configuration. Nevertheless the room layout or seating arrangements, the daisy-chained expansion speakerphone can take care of it. With Aver VC520 PRO’s full-duplex speakerphone, no more crowding round a speakerphone, now you may daisy-chain an extra speakerphone that may cowl as much as a 30ft diameter.