Negatives: ATTENTION - which refers only to my device> no idea if it also happens the other?
Since there is no power supply is included, I have used by Apple and Samsung.
Sometimes the RAVPower says it is full, I pull it off and the display shows only one of 4 LED.
Nevertheless, at least my grade 2 can still charge.
I had been 2 at about 20 events / each power supply was affected times.
Please note, if no one goes on to write, it is rather an exception.