I went to Overseas Chinese Town East Resort with my friends. There are two valleys, actually, a valley costs a whole day, so we choose the Grand Canyon. Certainly, the electricity of my cell phone is not enough to support a whole day, cause we usually need to take a plenty of photos, this is the hobby of all girls, haha... So that is to say, I need a lot of battery, what should I do? In the matter of the fact, I am a seller of power banks.Fortunately,I brought my power bank, the result shows that it is really convenient for me. When I went home, there are still some electricity. That is really wonderful!