Good equipment, its purpose, buy recommendation if you look at is on the below mentioned points in the clear

Delivery
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The device comes with
- Packaging,
- A flat USB cable (USB to Micro-USB, so for popular Android and other microUSB loadable device suitable)
- As well as an instruction manual.
Note: It is located (as can be seen from the description) no charger by! Here you should (or even better due to the greater throughput from Tablet) take the device from the mobile phone.

First Impression
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The device comes in a Frustration-Free, good packaging. It was loaded from the start with about half a charge (= a mobile phone charge). It fits comfortably in your hand, but is relatively large (about the size of a kiwi, but half as thick) and felt very heavy.

Function / Handling
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The function is described as very manageable. It invites the Power Bank (with its own power supply or via USB socket). Then one can draw about 2 to 3 battery charges for a smartphone or tablet a half load out. The store is also very fast (2.1 amps). As a size comparison: My LG G2 is charged in about half an hour about 50% (of course, as it is the devices own, take the last 50% longer). So perfect for emergencies or while traveling.

For emergencies (me times the car keys fell off) is incorporated a small LED lamp. So far this went even accidentally in your pocket. The button is recessed, so this is relatively unlikely. In addition, you have to press it twice.

What's still very much like the flat USB cable. This knot is not so good you can also throw it loose in the bag. It also makes a very solid and stable impression.

Conclusion
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Ansich makes it for me a very good impression. However, the plastic is cracked after a fall (function is unbeeiträchtigt).
The fifth star falls off due to the form factor. By rounding is not stable, but it is in a (trouser / jacket) pocket thus carry more enjoyable. Furthermore, the weight is felt high, but this is probably due to the capacity of the battery.

All in all, a good device, which I would recommend my friends easily. (Price taken into account)