Check the listing for details. Car Memory OBD Male Changing Power Cable Replace Battery Leakage Detection Tool. Condition: New. Listed at 17.99 USD. OBD Changing Battery Power Tools Replace Battery Leakage Detector Vehicle Emergency Power Supply Cable Memory Saver Description:It is very convenient to connect directly to the car computer through the OBD diagnostic socket. The battery power is normal and the red light is on. After the car OBD plug is inserted, the sound of drip is dripping, and the power is supplied by the 12V battery, which can ensure that the setting of the car computer is not lost when the battery is changed. Specifications:Name: Automotive OBD Battery Replacement ToolColour: BlackWire: bold copper wireLength: Line length: 1.1m/3.61ft, total length 1.3m/4.27ftPacking size: 15*20*2cm/5.91*7.87*0.79inSuitable for the crowd: small auto repair factories and individuals How to use:With a red clip to connect the backup battery cathode, black to connect the negative.Positive and negative polarity will burn the car computer.Plug the red light, and then insert the car OBD plug, this time has been issued by the sound of drops, indicating normal connection.At this time can change the battery, careful operation, pay attention to the replacement of the battery must lock the car, do not open the lights and other electrical equipment, not to the battery positive ground, otherwise it will burn the car OBD socket fuse.For a good battery, the first release of the tools of the red clip, if also drops at this time ring, indicating successful, if there is no sound, indicating that the fuse burned. (Note:Please do Not turn on the headlights and any car devices when replacing battery.) Package List:1*Car Memory Saver Battery OBD2 Replace Tool (Battery do not include)1*Use Manual Notes:German cars with delayed power cuts. It is recommended to wait for 20 minutes and then remove the battery, otherwise there is a risk of burning the fuse.