Easy Install Kit, HF600

Rating:
Summary: v710 alone provides better call quality than HF600
Review: You're probably better off with just a car adapter to power the phone and a technique to attach the phone to the dash so that it doesn't roll around on something like a car seat. The v710 provides best speakerphone quality to both ends if used alone.

I also tried to control the speaker volume from the phone (there's nothing on the speaker unit to do that), and wasn't satisfied.