So far the product works as advertised. Mine came with a booklet that had instructions about the App to use on my android phone that is compatible with the device. I received the readout from my check engine light errors and it saved me a trip to the car shop to diagnose the issue.

I was completely satisfied with the product. As describe in its description, very accurate.

Took awhile to come.

Get tool to have thanks

I love this diagnosis tool.. I works great on all of my cars. On My 99 Buick, it actually found a code for a bad EGR valve that never came up on the cars check engine light.. I replaced it and now it gets 4 more miles per gallon and runs much smoother.. On my other car and truck it was also great.. Even showed what me engine was doing as I was driving and even showed my turbo boost, vacuum psi, , speed, ect..right on my phone after downloading the app. And you can etrade old and new codes.

I have not used it yet but am please with the speed of getting the item delivered.