What practical electronic equipment and charging treasure should I bring when I go out?

If you only go out for half a day, bring a MA of 5000 or 10000; If you go out for two or three days or more, bring a 20000 mA! The following three products are 5000, 10000 and 20000 mA respectively. The first one can charge Huawei M9 twice, the second one can charge Huawei M9 3-4 times and the third one can charge Huawei M9 6-7 times. Although it is not a big brand, this product is very conscientious, high-definition color printing, and you can customize your favorite photos.