Discover All Your Pet's Invisible Dry Urine Stains Instantly With The PeeDar 2.0Shining your powerful PeeDar 2.0 on dried urine causes crystals in the urine to briefly absorb some of this powerful UV energy. The crystals then give off this energy as they cool down in the form of visible light, which we call fluorescence. Saving you from cleaning the whole carpet, which is both time consuming and expensive, the PeeDar 2.0 enables you to target just the problem spots and clean them at your convenience.Why The PeeDar 2.0 Beats Competing Brands: Significantly more UV output/fluorescence due to an increased number of UV LEDs which are also using the latest square chip technology. No overpowering purple light obscuring stain fluorescence. PeeDar 2.