advertisement
advertising
alert
amplifier
announce
announcement
attention
audio
background
broadcasting
bullhorn
call
color
communication
device
electronic
equipment
hand
hold
holding
horn
inform
isolated
loud
louder
loudspeaker
marketing
megaphone
message
object
old
outdated
proclaim
protest
public
rarity
shout
sound
soviet
speak
speaker
system
ussr
voice
volume
warning
white
yellow