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walkie-talkie 
Portable two-way radio used to relay the human voice over short distances.
volume control 
Button that controls the loudness of the walkie-talkie.
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 extension to another; when it is released, messages can be received.
speaker 
Integrated device used to generate sound.
display 
Liquid crystal display showing instructions for setting or operating the walkie-talkie.
antenna 
Device that emits and receives radio waves.