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This review is from: Decrescent 2 Port Micro USB Car Charger for Apple iPod/iPhone/iPad - Black (Accessory)
The electrical noise this charger make is appalling. Plug it in and your radio will produce mostly white noise with the actual station barely audible. Happens on a Ford Fiesta, Audi A4, Porsche Boxster and Land Rover Defender - all recent models.
Anyone who plugs their device in to charge while using headphones will have the hissing as well.