Don't shoot it into your eyes, the eyes of other people, the eyes of animals (like pet dogs or cats), vehicles of any type (ground-based or flying), or at mirrors or other reflective surfaces where the reflected beam can strike any of the targets I listed. And for heaven sakes, please don't fire it anywhere near a police officer - whether they're on the transmitting or receiving end of the beam.
Other than that, the laser isn't any more dangerous than a regular Class II or Class IIIA laser pointer.
Just be careful about shooting it near people, animals, or mirrors, and have fun with it. /ubbthreads/images/graemlins/smile.gif