-) The product is solid and the coating is quality. small downside the place where the 2 parts are clipped after some months seems to present a game, nothing serious but seeing lengthwise. no worries on the side of the LEDs and I often walk with me in my pocket yet the shells is almost like new
-) Rather fast charging via USB (even via a transformer) (about 1:30 and it is thoroughly)
-) Makes available approximately 1 extra battery on my 4S. Warning as mentioned above should be allowed to discharge iphone then turn on the switch that the iphone drops below 20%, and in this way the discharged shell once you are almost 100%. It is much less efficient if you turn the device while the battery is already full.
Conclusion This is a good tool for people who provide for long walks outdoors or who are music festivals over several days. I had bought for this purpose and I think it fully serves its purpose.
