We strongly recommend that you find a local retailer for purchasing the unit and having it installed. Generally speaking, a reputable, single-store car audio dealer will know more about the equipment and do a better job of installation than a chain store. Ask friends for recommendations or try to meet the owner of the shop ahead of time. And lastly, be careful using these systems in your vehicles. Whenever possible, pull over to the side of the road before dialing in your destination.
Distraction is a major issue facing drivers as more and more electronic devices enter our vehicles.