JacobsParts FLT-B 12-LED Handheld Blacklight UV Flashlight with Wrist Strap for Pet Stain Urine Detection (Black) 12 UV LEDs emit UV light, perfect for pet stain detection, hotel room inspection, counterfeit detect Takes 3x AAA batteries (not included) Dimensions: 40x107mm / 1.6"x4.2" Wavelength: 395nm Weight: 2.3 ounces