The adapter choice is wide and allows the use for other devices (GPS receivers, MP3 players, etc.). Impractical, however, that the adapter-set-up so far protrudes together with the cable connector out of the device, especially in mobile use that creates a cumbersome bulky, and given the small micro-USB connector sensitive formations. A compact cable, optionally with angle plug would be better.
Unfortunately, manual and manufacturer support silent about whether you must charge the battery in a cell phone charger plug with its USB standard deviating 1000mA. After I did not want to wait longer for an email response from the manufacturer, I made it easy so far and had no problems.
CONCLUSION: This thing is massive, with robust metal housing surface and is in the compact form thereby despite the not so happy Cable and connector version quite sympathetic. Although it has less compact dimensions, I would choose the next larger model next time, because at least once my smartphone should be vollzukriegen with his puny battery already.
NOTE: I wish from the smartphone manufacturers that they offer their devices finally with interchangeable backs, so you can choose whether you get a super slim short-term cell phone, or a hand-friendly working smartphone - both would then have a compact form uniform housing and the user would have to carry around any extra gimmicks with it.