The Polycom Expansion Microphone Kit for RealPresence Trio 8800 is a modular smart hub which is suitable for RealPresence Trio 8800/8500 conference phones. It has the capacity to provides of up to 20 ft extended microphone coverage and also comprises with a plug and play operation. By using this product, you can now afford to experience a clearer conversation as it offers an enhanced sound quality which is highly recommended for a group collaboration.