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.http://www.cnautotool.com/goods-6555-Launch+X431+Diagun+IV+Diagnotist+Tool.html