accident
alarm
alert
attention
background
bell
brick
building
call
care
color
control
danger
detector
electronic
emergency
equipment
escape
evacuate
fire
home
house
indoors
installed
loud
modern
mounted
object
office
prevention
protection
red
rescue
risk
safety
security
sensor
signal
siren
smoke
sound
system
technology
threat
urgency
wall
warning
white