alarm
alert
announce
area
bell
button
cam
camera
cctv
collection
communication
control
danger
design
display
electronic
emergency
gray
guard
house
icon
illustration
intercom
isolated
keypad
logo
monitoring
mono
network
observe
office
phone
power
protection
red
safety
security
set
sign
smart
speaker
stop
surveillance
switch
symbol
system
video
watching
web