The polycom soundstation ip 7000 extra microphones are for use specifically on the polycom soundstation ip7000 conference system they are supplied in a pack of two and they are of the same style and design as the ip 7000 main unit the microphones will extend the standard 20 foot coverage up to a further 10 feet connection of the microphones to the ip 7000 system is easy and once connected they are ready to use without the need of any further installation