First model with patented self-clean technology Superior suction power with innovative self-cleaning technology.Consistent & powerful suction: Patented ?self-cleaning? technology cleans filter automatically and offers consistent & strong suction.Dust-free work space: 99.95% of fine dust (>0.3 micron) is filtered while vacuuming with H13 HEPA filterReduced cost of ownership: Pre-filter technology increases main filter lifespan 3 times