With patented technology wind tunnel, this bagless upright vacuum cleaner delivers powerful, deep and washing performance. Uses three distinct air channels to lift and trap dirt and prevent scattering in the carpet, so dirt ends up in no more clean the floor. With red and green lights, the embedded system DirtFinder indicates areas that need more attention in cleaning May. The green light "clean", while the vacuum remains, except when the detector senses a greater amount of dust, then the red "sale" is lit to suggest additional items in the area until the light changes to green. The unit also traps 99.97 percent of dust and pollen up to 0.3 microns in size, thanks to its HEPA fi