Radio stations use waves to send out a signal to stereos or radios in the area. Stereos and radios go back a long way, they were even used in the old days of the Great Depression (1930's). So stereos and radios will probably be with us forever in some form or another. The personal stereo of the 1990's allows the user to listen while we exercise, walk, or work. The integrated circuit you see inside allows for all of this to happen on a much smaller scale. Remember how large the old radios used to be? Electronic devices just keep getting smaller. When listening to the radio part of the device pictured here, a transmitter(radio station) broadcasts signals and your radio antenna picks up the signals. You tune in the station you want and decide the volume(you can change the volume thanks to an electronic component called a resistor). If you want to learn more about radios, check out this link on How Radios Work.