I tested it successfully on a phone, tablet, MP3 player and Web Radio.
Its size and weight make it possible to win easily in a jacket pocket, for example.
Its very smooth finish without sharp edges and makes it pleasant to touch and prevents damage to the pockets.
LED light bar indicates the remaining charge.
Recharging of the battery and its use for charging various devices use very simply the same cable, a USB and mini-USB end to the other.
In short, it has all the qualities announced in its presentation page.
The only point I have not tested is its impact resistance, but his "beefy" appearance and the perfection of its finish make it very likely.