1KW309 code reader, plug and play, can scan the code clearly and quickly, very easy to use, even beginners can use this machine to read error code. 2OBD2 diagnostic scanner, able to read and clear engine fault codes; view frozen data, view vehicle information; instantly obtain the realtime status of the vehicle without going to a car repair shop. 3KW309 car code reader is a perfect car diagnostic tool which can quickly read and clear all types of stored fault codes related to vehicle emissions, pending codes and display code definitions. 4The portable size, nonslip surface and long diagnostic cable head allow professional diagnosis inside or outside the vehicle. 5With large LCD screen and four buttons, easy to use and directly indicate the test results. It doesn't need any batteries, you can get power from the vehicle after connecting. 6You can save diagnostic data on the KW309 OBD2 scanner, including fault codes, frozen frames and realtime data. Provide lifetime free software updates to fix the latest errors or add new parameters.