This charger is the perfect solution for people in cars with phones. The attached cable is coiled which prevents tangle; it is fixed which prevents it getting "borrowed"; and it is very sturdy so it will last a lifetime. There is also an additional USB slot which allows your ride along a rapid charge as well, provided they bring along a cable. This is also very useful if you have more than one device (GPS, dedicated vehicle music device, etc). The 3.4 amp output is sufficient to support rapid charging and will safely charge your device up to the maximum allowed by the device so you get the results your phone's manufacturer advertises. Quickly charge your mobile devices on the go