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