Griffin Evolve Add-On Cube Speaker + Speaker Charging Base

Griffin's Evolve Wireless Sound System was impressive in its own right, enabling users to dock an iPod in one room, then hear and control two battery-powered portable speakers up to 100 feet away in a home or office. But Evolve had a feature that couldn't be exploited until now: it could actually perform music through additional speakers, potentially creating a whole-home wireless audio solution from stylish and affordable parts. Now Griffin is shipping what it calls Evolve Add-Ons -- individual Evolve Charging Bases ($30 each), Evolve Add-On Speakers ($100 each), and a set of two bases and two speakers called the Evolve Add-On Set ($200).