I got a couple of these, to maybe cure UV-set epoxy.
It came with a big lithium battery and a charger.
Two weird things:
If I shoot it at a white wall, I can see the spot with my right eye, but not with my left one. The right eye has had cataract lens replacement.
I got a mild headache from just looking at the spot on the wall for under a minute total. I also get a mild headache from using a UV flashlight.