To use the car adapter, it must be plugged into the cigarette lighter in your car then you can start already. I have several devices at home and have my iPhone 5s and a Nexus 5 with the car charger charged the result: my smartphones were quickly (about 2 hours each) charged. Fortunately, I could no side effects (such as harmful interference to radio) notice.
For me it is clear: the MPOW Car Charger Adapter is now an integral part of my car. 5 stars for not only functional, but also stylish product!
PS: Whoever has written the lyrics here on Amazon, should quickly read over it once (eg: Apple data cable is not going [..] should rather "an Apple data cable is not supplied" hot.