This uv flashlight with 21 UV LED/12 UV LED allows you to cover a much bigger area without losing the intensity of the UV light. The application is perfect for inspection applications, security control, rodent contamination, hotel room inspection, and much more. Emits 395 nanometer wavelength 21UV LED allow to cover a larger area Makes semen stains and other bodily fluids fluoresce. Perfect for outside use such as hunting scorpions and minerals. Water and shock resistant.