The badge sends out an infrared signal every fifteen seconds.

They can also learn directly from other remotes by reading their infrared signals.

The other two use ultrasound or infrared signals and tend to stay aligned.

The remote uses an infrared signal, so it requires a direct line of sight to function properly.

Another common use is to extend infrared signals in order to place remote controlled products behind closed doors.

They connect to the game card via infrared signals.

It sends an infrared signal to a combination receiver and charging stand.

The devices look and work much as a television remote does, sending infrared signals to a receiver at the front of the classroom.

The infrared signals are silent and have not been implicated as health hazards.

As I told you, it is possible to override the electrical system using an infrared signal.