Wait a minute here! I'm confused.

Did you buy a diagnostic tool that plugs into the OBD II data port and talks to your smartphone and/or tablet to display operating parameters of your car? If so, then none of the suggestions so far have anything to do with this.

The scan tool module can connect via bluetooth or wifi, some can do either but most do one or the other. The module connects to your device to display OBD II codes, and lots of information on the parameters of your car. Depending upon the app you load, the module can display far more information than you have any clue what to do with.