The charger is working properly with the iPhone 4! Plugging, connect, upload -fertig! That's how it should be! Quality (considering the price) and good! Charging LED is blue with me instead of red as in the picture, but that's ok. Should also be mentioned that the plug does not fit into the iPhone 4, if you have mounted a Car, but that is to get over to my opinion.
Advantage:
-Works with the iPhone 4
-Thanks Kabelrolle very compact and tidy
-Price / Performance ratio very good!
Disadvantage:
Charger does not work with a so-called. "Bumper" the iPhone 4 as the connector is slightly too big. (Original cable fits)