Sony AIR-SA20PK Wireless Home Audio System for Sale. The package comes with one base-station plus eight remote sub-units. The base station has an iPhone/iPod dock plus an integrated AM/FM tuner with dual-source capability. That means you can play your docked music through a speaker system in one room, while a housemate listens to the radio through the second speaker system in another. Engineered with S-AIR digital wireless technology that has a range of up to 165 feet with no compression. Instead of using an iPod or iPhone with the base-station, I found that employing a “Bluetooth Receiver” gave much more flexibility (please see picture #5), plus it will allow the use of other non-Sony devices (ie: Android). Used but in good working condition. C/w owner’s manual. For more information regarding the AIR-SA2, please go to https://www.crutchfield.com/S-018qXlYux2H/p_158SAIR/Sony-S-AIR-PLAY-AIR-SA20PK.html