Caution: Do not expose your eyes to the beam directly.Advantage: There are 12 adapters that will accommodate practically all calibers from.17 ga. to 12 ga. Don’t worry about the adaptor becoming trapped in the barrel; Turning on/off the light is considerably easier with the press switch design.Efficiency: For serious hunters, shooters, and police officers, increase the precision and quickness with which they sight the bore. By eliminating lengthy live fire range testing, you may save both time and money.Using It Is Simple: It is really simple and straightforward to use. Simply screw the adapter onto the tool’s tiny end and put it into the barrel. It will just take you a few minutes to zero your scope.Quality: Using a high-quality module with certified electronic components to provide a long and stable lifespan.