Free: Contests & Raffles.
This oughta set you straighthttp://www.americanrifleman.org/articles/going-green-with-lasers/
Red is perfectly fine inside. Crimson Trace Laseres have a pressure switch that is activated by finger pressure on the gun grip. You don't turn it on and just leave it run. You light up the red dot when you need/want it. I have a CT red laser on my 40 Kahr, and have had it at least 2 years. Same batteries--still good.