However, the price comparison software also has some defects. On the one hand, some price comparison information is inaccurate. Because most price comparison software is called third-party information, not the official price of the manufacturer, but the price corresponding to the store itself, including some unverified information on the Internet (even the wrong information with a big gap). On the other hand, the types of goods that can be compared are also limited. Bulk food, clothing products that young people are very concerned about, and many other products that are not oversold, the price comparison software can not provide effective information. In addition, the models of mobile phones supporting price comparison software are limited. Mobile phones that can run price comparison software are mainly smart phones such as ios, Android and Saipan, while consumers who use ordinary mobile phones cannot enjoy the convenience of "shopping around".