Just saying they have these on Sale at Princess Auto Jan 7- 19.
I have one of these & it works with Android phones & tablets but not iPhone.
To connect my iPhone I purchased a WIFI OBDII reader which has it's own problems, it gets hot & runs down the battery over time + it competes with my home WIFI when the car is parked @ home.
This bluetooth reader is a little bulky so you may bump it getting into the car with it attached.
With this device you can at least monitor your engine temperature using one of the many free apps.