SUPER BRIGHT & LONG LIFETIME 51 LED UV Blacklight Flashlight Portable Detector Reveal an invisible universe with UV black light. Whether you're controlling a pest problem, verifying the authenticity of documents, revealing hidden pet stains in your house or hidden messes in a hotel room, our powerful light offers economy and strength in one compact design. How does it work? The UV black light works by showing phosphors,a substance that emits a visible light because of rediation. Since the naked eye cannot see them,we are reliant on help to spot them,the UV flashlight makes this possible. Q:Does this item can detect cat'urine? A: Yes it does . Q:Does this work for bed bugs ? A: Yes, the UV flashlight can detect bed bugs in the dark environment. Q:Will this device work for finding scropions? A: Absolutely And it works great. Q:Can it detecte human urine around toilet? A: Yep,this item works excellent on any type of dry urine. Q:Dose anyone use this to detect areas that need cleaning or in hotel rooms? A: Yes The UV black light works very well for this Q:Can i use it to find a leak in an air con in my car? A: Yes, but you have to put dye in the freon. Kindly Note: Can only spot dried urine stain. The ultraviolet led black light works best in dark environment, the darker it is, the better it works; If the ultraviolet flashlight does not turn on, please check batteries and battery case whether they are installed correctly(eg. with correct polarity) .