alarm
alertness
big
building
business
cam
camera
cctv
concept
control
digital
electronic
engineer
equipment
guard
home
industry
installation
isolated
lens
look
looking
maintenance
modern
monitor
monitoring
observe
office
outdoor
police
privacy
private
property
protect
protection
record
safe
safety
secure
security
spy
surveillance
system
technology
television
urban
video
view
watch
watching
定額
Maintenance of the video surveillance system. The engineer controls the operation of the video camera. A man with a laptop. Ensuring security. Installation of video surveillance systems.の素材 [FY310176288540]
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