The With this bundle, you not only receive the Logitech GROUP video conferencing system with camera, speakerphone, hub and more, but also two expansion microphones that extend the range of your conferencing. For larger meeting rooms, the GROUP system's wired expansion microphones increase your coverage from a 20 foot diameter to 28 feet. The microphones are plug-and-play: you just attach them to the include GROUP hub, which also organizes the connections from the camera and speakerphone. The GROUP is connected to a console via USB.