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Instructions:Hard aviation aluminum alloy material, (MOQ 100pcs to print your logo)LED type: 3W 395nm or 365nm UV ultraviolet lightpower supply: 2pcs AAA batteryInstall battery: twist to remove the tail, set up the batteries, shut and tighten the tailtake out the batteries when it isn't used for many years About wavelength:395nm UV soft nice for nail dryer, Scorpion hunting, puppy urine detector, glue curing, Fluorescent detector or payment up, mushroom spotting, hotel room detector, invisible ink track etc 395nm light: pink shade lightUV 365nm light: "weaker" purple shade light, but make object larger visible365nm greater for Gemstone and Mineral Inspection, cash detector