We got a 5-in-1 green laser grid. The thought behind it, is that once it has been set up the lights will twinkle or move if something breaks the beam. We used it during our investigation in Lawrenceburg a couple of weeks ago.
We had it focused on a hallway and central air and heat opening. My concern was the grid wouldn't show up on the cameras, but I was surprised when it did. The downside was when the batteries started dying in the pointer, it looked like something was moving in the room. It wasn't until I watched the video and noticed the light was starting to dim somewhat.
The laser grid itself comes with four inter-changeable lens for the pointer. There's a star burst effect, a larger effect, multiple ball shape, flat bar and a laser pointer. I know they make different colors.