I like so handy devices that are also very easy to use. The device seems to hold what it promises. In my Audi A4 Bj. 2005 exhaust warning lamp has burned suddenly. Since one does not notice when driving, I wanted to read out the error in order to assign them to. Machine infected, ignition on, press and already three errors were indicated among motor. By means of the table in the manual can be assigned to the error code describing the error in plain text. The error messages can be reset with the second key. The machine can do what is in the description. No more and no less. Anyone who wants to go deeper into the electronic control units, has probably also draw deeper into the Protmonee ;-)