Despite the high cost of a full-blown system, professional installers say they are getting more calls, even as the economy continues to sour.

They should be ordered from a professional installer and also programmed by a professional.

Why hire expensive professional installers when you can do it yourself?

That allows users to move the radio to rental cars or other vehicles without bringing a professional installer into the picture.

Similar systems for mounting in walls are available through professional installers.

"But estate owners who buy multiple units will need professional installers."

And it's so easy, there's no need for professional installers.

The more elaborate the system, the more sense it makes to hire a professional installer.

These labelling proposals overlook the key role of the professional installer.

As such, they cost from $1,200 to $12,000 and require a professional installer.