Works but massive disruption of the radio reception

In principle, the charger works as described, as far as I could test it. The two ports are wired differently and thus allow different devices to recognize the adapter as a charger correctly. My Samsung Galaxy Nexus for example detects only one of the ports as a charger and would invite the other port only 500 mA.

Unfortunately I have to return the item, as it massively interferes with radio reception in my car. Sometimes even so much that I just can hear noise. How big is the disturbing influence, seems very individually by radio and car depend, as other users (in other chargers) have no interference.

I tested two more charging adapter, so that I can compare it.

PowerGen Dual USB Car Adapter 2 USB ports with 3.6 Amp 18W Car charger
significantly less interference, but still too many in my case

Nokia DC-20 Car Charger with 2 USB ports and 2 USB cable
no disturbances, but "only" 2x 1 A charging current according to the manufacturer