X-431 PRO is a new type of auto diagnostic device developed by LAUNCH based on Android system and Internet application. It inherits LAUNCH company’s product features of vast cover of car modules, strong diagnostic functions, many special functions, and precise test data Through Bluetooth communication between diagnostic connector and smart terminal device to realize all car modules and full system auto malfunction diagnosis. X-431 PRO has the application advantage of mobile Internet, which could sharing the Maintenance and cases database of the DBScar network., also provide instant maintenance information, create public and private circle and so on. So as to enter a vast auto diagnostic community. This is an internet application based classic diagnostic device provided by Launch to diagnostic industry.