alarm
alertness
background
beige
burglar
camera
cctv
circuit
color
control
copy
crime
danger
detector
device
digital
electronic
equipment
footage
guard
house
industry
inspect
lens
modern
monitoring
object
observe
perspective
police
prevention
privacy
property
protection
record
safety
security
sensor
space
supervision
surveillance
system
technology
text
video
view
vision
wall
warning