As the rapeseed yellow color was not already enough eye, the upper arrow is lit in the display in different colors, and so shows how much residual energy of the battery is still housed in its plastic case. Also fine (although not new): as a flashlight makes the battery a good figure. The package includes two micro-USB cable, a plug for the electrical outlet is available separately (if not already in the budget of other rechargeable devices available).
The battery is charging quite simply by his middle connector, power it can deliver to two devices in parallel by two USB ports. So far I'm very happy with the battery, it has not discharged automatically even many days of disuse. The weight of the tranformer 9000 is also perfectly okay to take him in a pocket.
For frequent travelers, who like bright colors, the external battery is definitely recommended.