This is UnionPay's own product, so there should be no problem. The payment company's own pos machine is quite safe. Other companies' mobile phone POS machines are similar to this one. If you keep swiping your credit card, it's better to swipe your local merchants with pos machines, which is better for your credit card. If it's the kind that jumps over merchants all over the country, try to brush as little as possible. Just brush it once or twice a month. Try not to brush the top mold.