The X-ELM is a diagnostic scan tool, trip computer, logger, and real-time performance monitor. and via Bluetooth module the data will be transmitted wirelessly to the smart phone providing vehicle condition monitoring. It is a useful gadget whether you are a DIY car owner or skilled mechanic. It is easily to plug in your car's OBDII port, reads data sent by car's on-board diagnostic system, detects trouble code of ECU and gives you the solution to fix it without having to take your car to the shop every time. Save money and time!