BestGrew&reg; UV Ultra Violet Blacklight 9 LED Flashlight Torch Light Outdoors- Ultraviolet LED flashlight - Blacklight Reveals Hidden Pet Stains and Urine/ Currency/Jade and Authenticate Documents Detector,Scorpions Detector UV flashlight material: high quality aluminum alloy. WL(wave length): 385~400nm Powered by: 3 x AAA batteries (NOT INCLUDED) Dimensions(L x Head Dia. x Body Dia.): 3.62 x 1.06 x 0.98 inch /9.2 x 2.7 x 2.5cm UV light used to prevent forgery, authenticate documents,jade and currency for example.