portable sound systems 
Small self-contained sound reproduction equipment that can be carried easily from one place to another.
Equipment used to receive signals transmitted by radio stations.
Button that controls the loudness of the radio.
bass tone control
Button used to adjust the relative level of low-frequency sounds.
treble tone control
Button used to adjust the relative level of high-frequency sounds.
Button used to select a broadcast frequency.
FM receiving antenna made up of sections that extend upward.
Device showing the broadcast frequency of a tuned station.