DLO is actually selling two different options: the Headphone Adapter for iPhone ($10) and the Headphone Splitter ($15), each with a clean, almost entirely black plastic design. Whereas the 4.5-inch-long Headphone Adapter does nothing more than provide a way for you to connect one pre-iPhone headphone plug to the device?s recessed, thin headphone port, the six-inch corded Headphone Splitter lets you connect two plugs to the iPhone at once. But?