When operated properly, these devices are perfectly safe. However, the lasers are powerful, so some care is required.You should never look directly into any laser beam, and though that's unlikely to happen when using the laser engraver normally, eye protection should always be worn to prevent any danger from light bouncing back off a reflective surface. It's also important to keep your hands well away from the path of the beam. If it's capable of burning into wood and leather, it will have no trouble with skin.Finally, you need to consider the item being engraved. Smoke from many plastics, fiberglass/resins, and other materials is unpleasant and, in some cases, poisonous. Work in a well-ventilated area, and wear a mask if necessary. The better laser engravers provide exhaust/extraction fittings. Manufacturers should provide safety information. If in doubt, check online sources for further details.