What dongle should I buy?

ezOBD is designed to work with any WiFi OBDII dongle including the cheap ones.
We tested several of the ones that are less than $20 and could not find operational issues.
Many of those claim to use the authentic ELM327 device but do not.
One way to tell is that those particular ones say ELM327 version 1.5 but
the authentic ELM327 does not have a version 1.5.
Another thing to watch out for is the CD that comes with some of those cheap ones.
For one that we ordered, we found viruses on the CD but the CD is not necessary
for the dongle to work and the odb scanner worked fine with ezOBD.

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