I beleive the 671 is the same I have.
It is a great unit. Definately have it professionally installed.
I was hit in a parking lot and it notified me. When I went back to my H2, the person who tried to pull into a stall next to me just brushed up against my brush guard- which you couldn't even tell it had been hit. It is well worth the money to have the two way communication. I also like to know that the auto start really started it.
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