This is a iOS app that communicates with an ELM OBDII (OBD2) car interface device. The ELM module(s) supported are network to serial interfaces that use wifi to communicate. How to use: - Make sure your car is OBD2 compatible. - Locate your car’s OBDII diagnostic port and plug in your scanner. - Turn on your ignition by turning your key to the 2nd turn. - Start your engine. Although the OBDII port is providing power to the scanner, in some cases you will not be able to retrieve any engine data without the engine running. - Install Torque Tools Pro for your iphone/ipad/ipod. - In this App, click "Setting" - scan & select your OBD2 device. (Make sure you connect correct OBD2 device - try 192.168.0.10 or 192.168.0.123) Please feel free to contact me if you have any questions or concerns.