Using this laser tag set is super easy. First, turn on the two laser blasters. Each player holds one blaster. Then, start the battle either indoors or outdoors. When you see the light indicators on the back of the blaster change colors, it shows how many lives you have left. If you hear the 'empty' sound, it's time to reload your ammo. When you get hit or hit your opponent, you'll feel the vibration and hear the sound effects. As for precautions, keep the blasters away from water and don't point the lasers directly into anyone's eyes. For maintenance, after each use, turn off the blasters and store them in a dry place. Check the batteries regularly and replace them when they're low.