There are about 20 mobile card readers operating on the market. Three manufacturers that have passed UnionPay certification include Huazhongxing Electronic Technology (customers include more than 60 payment partners such as Lakala, Alipay, Kuaiqian, etc. It is the first company in the world to develop and produce mobile phone card readers), Box Pay and Xinyada. Products from other manufacturers have not passed certification. As financial instrument products, safety performance is important.