With this small charger on board, no more anguish, it fits in your pocket and charging technology slowly, I can use it at the same time, and even introduce the iPhone to the hostess still supported.
In short my iPhone lasts twice as long and that's what you need for a day trip or I ask a lot 4G terminal without having to reload.
Benefits:
Lightweight and compact. Can charge the battery of an iPhone to 100%. Fits in your pocket or in a small travel bag. The short cable is convenient and robust. It's reliable.
Weak points:
Especially the speed, it is only a troubleshooting tool. It needs time to be loaded and the time to charge the iPhone. No charge indicator. We must get out of his shell iPhone to connect the cable. But I prefer a light and cheap tool with these weaknesses.