attention
brother
cam
camera
caution
circuit
collection
control
crime
danger
digital
electrical
electronic
equipment
guard
icon
industry
lens
looking
monitored
monitoring
museum
observe
outdoor
outline
police
privacy
private
property
protection
record
safetytechnology
secrecy
secure
security
set
sign
spy
surveillance
symbol
system
television
theft
video
warning
watching
white
zone