As reported in great detail already some colleagues who 10.400mAh stated are not "real". X (here 10,400) divided by 5 (volts) x 3.7 (V) represents the real amount of energy emitted by the battery. That's according to Adam Riese 7.696mAh. I have used two charge cycles and always came pretty much to the same value: 6.700mAh. This is quite good, more than the average value in my opinion.
The aluminum shell quite sensitive and is therefore susceptible to scratches. For safe transport in a handbag or the like, the manufacturer has settled a little bag, which is to prevent unsightly scratches. The German manual is understandable. At the processing power bank I had nothing to complain about - quite the contrary: Everything makes a stable and high-quality impression. The charging cable can be both Apple devices, as well as all standard Android and of course (Micro) USB-loaded devices energize. Bit unwieldy, but very innovative to my taste.
Conclusion:
Who would like to have it noble and flat, making the purchase of this external battery pack nothing wrong. A buy recommendation can I say 100%. Together with the self-willed, but practical charging cable, the Transportbeutelchen and the "lifelong" guarantee this article gets scarce by me. Instead of customers images I have created a short video that will complement my vote yet. For further questions I am always at your disposal. Finally, I would point out that I have received this product for free to publish at Amazon review. This brings exclusively my own experience with this unit expressed. A complacency rating (because free) can be ruled out.