Every time I go on a business trip, I will prepare a adapter, because there are some places where the power interface is not used directly so it is necessary to get a universal adapter. The last trip was due to a tight schedule, so I forgot to bring adapter when I packed my luggage. Fortunately, I went to the hotel for a business trip. I bought that adapter or a friend to help recommend because I have always been not very good at these electronic products, do not know what kind of good use, there are some friends who understand electronic products, so I can buy a good quality and cheap adapter, it seems that more knowledge of knowledge is still necessary.