LingsFire 21 LED UV Ultra Violet Blacklight Pocket Flashlight for Spotting Scorpions and Bed Bugs, Counterfeits, A/C Leaks, Pet Stains, Counterfeit Money Detector and Detect Fluorescent Substance (battery not included) 21 LED Super bright. Durable in use: 100,000 hour bulb life. Mini ultra portable, easy to take with. Click on and off switch. Light in the 390 to 395 nanometer wavelength. Aluminum construction, with knurled grip. "O" rings for water resistance (not submersible). Rugged and durable - shock resistant. Multi-functional in Document and forgery analysis; Crowd and access control; Crime scene inspection; Currency and Bill verification; Leak detection; Rodent detection;UV Curing; Painting and Rug Repair Detection; Gemstone and Mineral Inspection etc.