Just for kicks, I conducted an experiment a while back. I wanted to see whether the red dot on the Romeo5 actually powered down after 2 minutes the way SIG says it will. And I was curious to find out how much movement was necessary to reactivate the reticle.
Well, it turns out that the sight does power down after 2 minutes. and, believe it or not, I was able to reactivate the reticle by doing nothing more than breathing hard on the gun. Awesome!