This charger will charge my iPhone 4 and make a cool BRIGHT blue LED (Make sure the LED light is not directly to you eyes). But the major problem is it will make a loud noise itself and also interference with my car audio system while in charge. I tested this in both of my cars and this problem consists, therefore I conclude this charger is useless. If you can stand loude noise while playing music then this might work for you otherwise this product is worthless piece of crap. I suggest not to waste your money here.