alert
amplifier
announce
announcement
audio
background
black
blue
blue sky
building
bullhorn
column
communication
concept
construction
dark
design
electric
electrical
electricity
equipment
information
interior
light
loud
loudspeaker
megaphone
metal
modern
nobody
object
old
pillar
pole
power
public
roof
silhouette
sky
sound
speaker
steel
structure
system
technology
terminal
tripod
volume
warning
white
定額
large industrial installation on the roof of the building with antennas, camera, megaphones to warn the public about the danger, wiresの素材 [FY310150918774]
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