Altec Lansing M812 Octiv Air Wireless Speaker System with Dock for iPod (Black) Wireless speaker system lets you place speakers anywhere in your home Powerful digital amplification provides 80 watts RMS Add additional wireless speakers for multi-room broadcasting Dual 4-inch drivers and 1-inch tweeters provide outstanding sound quality Measures 17.5 x 10.75 x 5 inches (W x H x D); backed by a one-year warranty