These are extremely capable little flashlights, the ultrafire offers amazing performance.
Runs on a single AA battery.
For Under $6 delivered, it's an amazing price for a neat product.
1.Average lifespan 100000 hours (2-3 Hours per battery)
2.Also designed to mount on certain hand pistols, rifles and shotguns with proper mounting equipment
3.Adjustable Focus ,you can Zoom in/out to adjust its beam .
4.Waterproofing shell allows the flashlight to be used in rainy day, but don't use it under water.