If you are one of the lucky few to own the Harmony 1000 or 890 universal remote controls, you have the added option of using up to four of these RF to IR extenders. Each RF wireless extender comes with four dual IR emitters, making each one capable of controlling up to eight components. To top it off, you can program each emitter to independently work each component, so if you have four identical CD changers, each one can be controlled properly without interfering with the other three. Priced at just under $100, the RF Extender allow total consistent control of your components, even when there is no clear line of sight or even when they are in different rooms. Should you have multiple RF-compatible Harmony remotes, don't fret. You can "mate" each RF extender to the remote that controls it, so you could easily have several separate systems using these without interference.
Learn more about RF Remote Controls here.