Good, I like that the Power Bank has a on-off switch and the green charge indicator blinks while she works. So you can 1. the charging cable and simply let time stuck and 2. you can see if it still delivers power or not.
In addition, the 3 green bars show the same time the remaining battery power on, can be seen when it is full and has to load an external device an approximate overview of the remaining residual capacity.
Both the Micro-USB input, and the USB output both have a capacity of 1.0 mAh.
The USB output can charge each loadable via USB device. Whose unit has now mostly usual microUSB input does not even need an additional charging cable. Those who do not, the need the appropriate adapter, and the appropriate cable also pack still.
The Power Bank has a capacity of 5600 mAh. Whether that is enough, depends on the equipment to be loaded and the loading frequency from. If you need more, but has more drag, the more capacity, the bigger and heavier. My Galaxy S2 invites eg 2x, before you run out of juice.
As a nice extra features they bring a small LED flashlight that illuminates either permanently or sends a long press SOS and an infrared laser pointer with. For its proximity to the reading beam in the dark is good, dark forest paths it is not lit from.
For emergencies thought the laser pointer has as a longer range, shone in her eyes, she also helps against the dark villain ;-).
Conclusion: A well-made power bank, which is by the size, weight and processing for the outdoor area ideal, stands out by its IP67 certification of many other outdoor battery and therefore its slightly higher price is absolutely worth it.