Green 350 mW laser with SMA connector for connecting a fiber optic cable used in our DPTV (Digital Particle Tracking Velocimetry) system. The laser pointer comes with a rechargeable battery and charger. The laser is powerful enough to light matches and is for professional use only. Leave it on for max 30 seconds at a time, and then allow min 30 seconds to cool down. Use protective glasses at all times. This is not a toy and it is MUCH more powerful than a laser pointer used for presentations.