With the children is such a thing. In all sorts of devices the batteries are inside. Clearly we have to play with it everywhere and always. And when the batteries are empty then, the cry is great. This is exactly what I was looking for a device. One that I also can sometimes take straightforward in his pocket and then can charge the battery while on the go. The choice was then to here from Ansmann. From the manufacturer and the quality, I am convinced, and the price is really reasonable. When USB function first I thought: Well and good that it is, need I will not probably. But yesterday it was my knight in shining armor. Was able to upload my smartphone. With an empty battery or without this charge possibility I would have been screwed. Therefore, and because I could find little to nothing else negative, there is for my Savior the Powerline light whopping 5 Stars.