機器
alarm
automation
beacon
bright
button
closeup
control
controller
danger
detector
device
electric
electrical
electronic
emergency
engineering
equipment
factory
flasher
flashing
green
indicator
industrial
industry
interior
lamp
led
light
machinery
manufacturing
metal
modern
panel
plant
power
railroad
red
revolving
safety
screen
signal
siren
start
system
technology
warning
water
work
zone