This powerbank is compact and not too heavy. It has some really nice features: two USB ports which are fully compatible to Apple (both charged my iPad with 2.1 A), one of both also supports Quick Charge 2 (Android). One standard DC output for 12 up to 24 V, adjustable. It can provide a lot of power (65 W). The ADI-2 Pro, playing music to a headphone, played exactly 5 hours. The LCD tells you how much Watts are currently drawn (between 12.5 and 14 with the ADI-2 Pro), what output voltage is selected (I chose 12V), and how much juice is left (switched itself off shortly after 0% was shown). The display is more accurate than I expected, for both state and power measurement.
I also measured the quality of the 12V output. The lower voltage of the internal LiPos is processed by some step-up regulator to 12, 16.5, 19, 20, or 24 V.