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Because of this mass rollout, industry would like to create a device that does not need professional installation.

Most brands are represented, and they offer professional installation.

Some backup systems can be easily installed at home, but others require professional installation.

The Telegraph Magazine has one of these systems to give away, including professional installation.

The speakerphone ($99 at driveblue.com) does not require professional installation.

Manufacturers say professional installation usually takes about six hours for jobs with no complications.

The direct-wiring approach can give much better sound, but it is also more expensive and requires professional installation.

Both require professional installation and use smaller video screens than the built-in models.

Each costs less than $100 installed, with professional installation recommended to be sure they are sturdy.