push-to-talk switch
/ˈpʊʃtətˈɔːk ˈswɪtʃ/
n
English · push-to-talk switch中文 · 通话按钮Español · interruptor de emisiónFrançais · interrupteur d’émission
意味：When this button is pressed, voice messages can be sent from one CB unit to another; when it is released, messages can be received.