Zimo New 21 LED Uv Ultra Violet Aluminum Alloy Flashlight Blacklight Torch 3x AAA 1.Emitter Type: UV LED 2.Battery Configurations: 3 x AAA batteries (not included) 3.Runtime: About 20 hours(depends on battery capacity) 4.LED Lifespan: 100,000 hours 5.Material :Aluminum Alloy