I had my Parrot devise installed professionally the day after I received it in the mail. This is by far one of the best purchases I've made in terms of cell phone devices. The sound quality is clear and excellent. You don't have to yell in the mic to be heard on the other person's line. It was easy to link to my T-Mobile sidekick. This unit is very easy to use. If you have kids, I highly recommend this item. I'm getting another one to put in my wife's van.