New technology has led to improved performance and often to lower prices, and many systems are very simple for the do-it-yourselfer to install, even in an existing home. As is typically the case with a home improvement project, your first step is to decide what type of system you wish to install. An intercom system is simply a two-way transmit/receive unit that allows one person to talk in one location and another to listen at a different location. From there, you can increase to multi-room capabilities; radio, cassette, or CD music systems; speaker upgrades; and the addition of fixed or movable video cameras with one or more black and white or color monitors.
