AD20 PK ELM3271.AD20 have XTOOL own software free and keep update but elm327 software need pay and no update2.AD20 support OBD2 and engine diagnostic but the elm327 only for OBD2 diagnostic3.AD20 have more Premium and Smoother Procedures than ELM3274.AD20 Support for Driving record and Driving analysis and also the HUD Functions5.AD20 Better hardwares of the bluetooth 5.0 support android and IOS6.AD20 support RussianWhy choose XTOOL Advancer AD20 ?1. AD20 can read the error code of OBD2 and clear the error code, and analyze these error codes (what causes) (how to solve) (what should be done now)2. AD20 supports engine diagnosis(check engine light on), which can detect the error code of the entire engine (only supports engine code reading/detect code)3. AD20 supports driving records and driving analysis, each driving data will record and analyze the fuel consumption, distance, and some driving behaviors during driving.4. AD20 supports the performance test of the car, you can see some values and performance of the car through the acceleration of 100 meters5. AD20 supports HUD function and there are many online exquisite instrument styles for you to replace6. AD20 software is independently developed by XTOOL, the latest Bluetooth 5.0, supports Android and IOS. And the software is free and constantly updated7.AD20 Full Pin High-quality chips and shells are tested repeatedly before delivery, and various problems can be solved through hardware and software upgrades. No need to worry about any quality issuesSupport Language:AD20 currently only supports three languages: English, Spanish, RussianThe rest: Arabic, French, German, Japanese, Korean, Polish, Portuguese, will be added in the settings in the next update (if there is no language you can choose, just wait for the next update)AD20 Extended functionAD20 supports simultaneous binding of multiple car models (you need to scan the product code on AD20 to bind AD20 for each binding) If you have multiple cars, you only need one AD20 to bind multiple cars at the same timeFeedback and comments: If you have any discomfort during use or if you have better suggestions, you can submit your comments and feedback online, and we will optimize and adopt some reasonable suggestions in subsequent upgradesAD20 OBD LIVE DATAAD20 supports OBD2 data flow analysis, specifically see a series of OBD2 engine data such as water tank temperature, throttle speed, etc.Trip RecordingAD20 can record each time you drive after the record, the specific distance traveled and the average driving speed. Let you have a good arrangement for your itineraryTrip DetailsEach driving data AD20 will have specific data analysis, driving time, driving distance, average fuel consumption (for reference only), average speed and maximum speed.And will record a series of data analysis such as sudden acceleration, sudden turning, emergency braking, and fatigue driving. With this data, you can clearly know the driving habits of yourself or your family, so that you can have better driving habits and let life is saferHow to activate and use AD201. Download and install the AD20 application software (Advancer AD20) in the APP store or the Android market (or scan and download)2. Register and log in to your account in the Advcaner program (requires email verification)3. Connect the car and bind the car (need to scan the product code of AD20)4. Keep AD20 connected with Bluetooth (Bluetooth is connected inside the software) and enter the software5. Start diagnosisAD20 with HUD functionAD20 can real-time engine data, when connected to the car, the mobile phone can be adjusted to HUD mode, and placed under the car glass, the engine value can be displayed.