Brightonnet today unveiled its simple, portable Tube Speaker for iPod. The 4.4-watt stereo set comes in metallic black, blue, green, and silver to match the aesthetics of the second-generation iPod nano but is compatible with any click wheel iPod courtesy of a universal dock adapter. The system is light and small enough for traveling at 6.3 ounces and 7 inches long, and can be powered by four AAA batteries. Brightonnet does not list battery life but does note that the Tube Speaker can be powered and synchronize its attached iPod through USB. The company officially delivers its speakers on December 11th for $26.