... , the LED indicator is Red. It turns to Green color when full charged. 2, How to know the power bank's electric quantity ... quantity. 2-2, Green LED indicator shows capacity: 25%-75%-100% 3, How to charge cell phone, iPhone, iPad1, iPad2 or MP3, MP4 ... the capacity shows 25%-75%-100%3-2, use USB cable to connect with power bank, the other port connect to charging device automatically.3 ...