F Fowler9 New member Mar 21, 2009 #1 How do they change from green to red? is it automatic sensors or does someone watch with a camera?
N Naren_RocksU New member Mar 21, 2009 #2 They keep timers to set the time in that electronic equipment. And the lights work according to that time delay.
They keep timers to set the time in that electronic equipment. And the lights work according to that time delay.