395 nM UV Ultraviolet LED Flashlight Torch Blacklight (41LED) Emits 395 nanometer wavelength, hunting scorpions and minerals! 2 mode operation: Press on/off button ONCE - 21 LED mode, Press on/off button TWICE - 41 LED mode Essential tool for law enforcement, postal inspections, customs, medical forensics, HVAC repair Waterproof to suit various weather conditions Powered by 4" AAA" Batteries. Easy for replacement