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CB radio ![click to hear : CB radio click to hear : CB radio](../../../images/speaker-vert.gif)
Two-way radio often installed in a vehicle; it transmits the human voice over reserved frequencies on a public band.
microphone jack ![click to hear : microphone jack click to hear : microphone jack](../../../images/speaker-vert.gif)
Unit designed to accept a microphone cord plug.
channel selector ![click to hear : channel selector click to hear : channel selector](../../../images/speaker-vert.gif)
Button that selects a frequency channel for sending or receiving voice messages.
display ![click to hear : display click to hear : display](../../../images/speaker-vert.gif)
Liquid crystal display that shows the channel in use.
microphone ![click to hear : microphone click to hear : microphone](../../../images/speaker-vert.gif)
Device that converts electric pulses into broadcast or recorded sounds.
push-to-talk switch ![click to hear : push-to-talk switch click to hear : push-to-talk switch](../../../images/speaker-vert.gif)
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 ![click to hear : cord click to hear : cord](../../../images/speaker-vert.gif)