I forgive 3 stars because the car charger is small and convenient and the price for charger cable is quite favorable. The remaining 2 star does not exist, because the charger for the Sony Xperia Z has too little power. But now in detail: I have this original Sony bought car charger for my smartphone Sony Xperia Z, because I was of the opinion that it fits perfectly for my phone. But that is not true because the output power is only 1.2A. By comparison, the normal charger for the outlet has 1.6A. Granted, the charger is small and handy and works out pretty well. But I get, when I wanted to charge my Sony Xperia Z in the car and at the same time, the navi was on the phone in operational problems. To my surprise, the battery is slowly discharged rather than charged. The charger does not provide enough power to charge the phone while playing a navigation or to keep the battery level. But precisely for that I need but a car charger! I then (Astro E5 anchor) tried with an external battery power bank with 2A output, whether it is at all possible to charge your smartphone while Navi runs on it. Lo and behold, with 2A output it worked perfectly. I have now bought from Wicked Chili the car adapter with 3.1A to even a smartphone of my children load in parallel if necessary. With the Wicked Chili Car Charger My Sony Xperia Z works fine. I've run the Navi while the battery is charging. So it is possible! However, not with the original Sony accessories.