It was also introduced by a friend. Hunan junan technology is good, and it is indeed a formal and reliable enterprise. A few months ago, I read the "blog of Hunan junan technology" and contacted and cooperated. Although the price is a bit expensive, it is quite reassuring to cooperate, unlike some companies that only want to make money.
I suggest you refer to the "blog of Hunan Junan Technology". Anyway, I personally appreciate this company. I hope it helps you.