alarm
business
camera
cctv
city
control
crime
danger
detection
electric
electronic
equipment
exterior
guard
industry
inspect
instrument
lens
look
monitor
observe
optical
outdoor
police
privacy
private
property
protect
protection
public
record
recording
safe
safety
secrecy
secure
security
spy
street
supervision
surveillance
system
technology
television
urban
video
view
warning
watching