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CB radio 
Two-way radio often installed in a vehicle; it transmits the human voice over reserved frequencies on a public band.
microphone jack
Unit designed to accept a microphone cord plug.
channel selector
Button that selects a frequency channel for sending or receiving voice messages.
display
Liquid crystal display that shows the channel in use.
microphone
Device that converts electric pulses into broadcast or recorded sounds.
push-to-talk switch
When this button is pressed, voice messages can be sent from one CB unit to another; when it is released, messages can be received.
cord
