Mode $06 is advanced mode of OBD2/EOBD diagnosis function. It provides real-time monitor of O2 sensor, catalyst sensor, EGR sensor, EVAP sensor, air sensor, fuel sensor, mis-fire sensor, and much more additional information. The app allows real-time plot of all mode $06 data to help you diagnosis a vehicle. Besides the advanced mode $06 support, the app also supports mode $01 live data monitoring, as well as basic trouble code reading functions. The mode $01 includes hundreds of sensor data such as engine intake pressure, engine RPM, vehicle speed, engine timing, fuel trim, and much much more. You can read http://en.wikipedia.org/wiki/OBD-II_PIDs for more information. The app also allows user defined PID so you can monitor things such as Prius electric motor. The app includes pre-defined files of standard PID, Prius PID, Ford PID, GM PID, and freeze frame PID (for mode $02). The app needs an ELM compatible Wi-Fi or Bluetooth Low Energy (for iPhone4s and later) adapter to work. You can check Developer WebSite for Adapter Guide: http://www.outdoor-apps.com/enginelink.html *** If you have bluetooth OBD adaptor, please contact email@example.com for instruction before you purchase this app. *** Our email address ends with org. Please use the correct address to ensure timely response.