X431 Diagun IV is a new diagnostic tool release by Launch tech. It composed of an X-431 PRO pad computer, a protection sleeve, a DBScar diagnostic connector and many OBD1 to OBD2 connector. It communicate with your car by DBSCAR connect with bluetooth, it read car DTC and do diagnose function by the X431 Pro Pad computer, it achieves X431 series full car model and full system diagnose function, it can replace X431 Diagun III or X431 IV.Meanwhile, taking advantage of mobile internet, it integrates more application and service, such as creating maintenance data base and case library, providing instant maintenance information, establishing public and private maintenance social circle etc. As a result, it builds a broad vehicle diagnostic community, which helps you to share vehicle maintenance knowledge online, exchange vehicle maintenance experience online and provide vehicle maintenance related service support online. This will be another revolution raised by Launch in the vehicle diagnosis industry.