Ad is somewhat misleading
Crutchfield Customer Review (What's this?)
This purchase includes two charger units, one is wall-powered and one is Automobile DC-powered. When I chose it I understood that each unit had two USB output ports. That was wrong as the wall charger has only one, while the DC charger has two outputs. Since I bought the unit primarily as a travel device I was counting on the dual output from the wall charger more that the DC charger. I will continue to use the unit, but believe the ad description could be more specific.
Pros: The two units works as advertised and output is good enough to charge an iPhone 4 or iPad 2.
Cons: Single output on Wall Charger