This is a really plain and simple red laser. We tested it at 3v, and 5v, and a great red beam shows up at around 60 feet away. The tip has a nice groove all the way around to help secure it in place, and the leads are thin enough to slide right through holes in great for tinkering perfboard. Because of the current draw, we recommend triggering using a mosfet.
All of the standard safety rules apply, don't shine it in the eyes, etc.