I actually wanted to charge only 18650 battery. This can, of course, the unit and it can be better but also stick directly into a USB port of a PC or directly in the charger of the mobile phone by the enclosed accessories / cables. (Here is indeed usually a higher charging current (1-2 amps, whereas USB 3.0 yes only 1 Ampere). One can simply unplug the USB to micro USB cable which is wrapped around the clip below, then plug it back into the micro USB connector of this charger and connect to the PC or charger. So you load rechargeable batteries (eg, 18650). The display is the approximate percentage indication of the capacity of the battery and you can see from the bar to the right of the display that is loaded. Very nice (and I have not previously read or seen that this charger can fast), can the USB cable to the bottom plug (under the clip to which it is otherwise wound) and the micro USB end of the cable, for example in the cell phone pocket. Thus you can load with this charger the phone. Thus, the inserted battery has a kind of power bank is then (in the 3.7V 18650 batteries so you have a capacity of approx 3700mAh, you may transfer his mobile phone). Very nice feature which I did not expect and which I will possibly ever use. The rest: processing, accessories, and the inserted mini-manual (English only) are completely in order Like!