DUOCLEAN DETECT: The two-brushroll system with four sensors automatically senses hidden dirt, debris, and hair, and the Detect Pro reacts by boosting suction and brushroll speed for maximum performance. DIRECTION DETECT: While most vacuums tackle debris only when moving forward, the DuoClean Detect nozzle picks up debris in both forward and reverse for powerful cleaning. FLOOR DETECT: An ultrasonic sensor detects the floor type and the Detect Pro reacts by automatically adapting its suction level and brushroll speed for optimal performance on all surfaces. GUARDS AGAINST BAD ODORS: Odor Neutralizer Technology guards against bad odors inside your vacuum for a fresh-smelling home. ANTI-ALLERGEN COMPLETE SEAL: Works with a HEPA filter to trap 99.99% of dust and allergens inside the vacuum, keeping them out of the air you breathe. (Based on ASTM F1977 of particles 0.3 microns or larger. Allergens refers to non-living matter.) The Shark Detect Performance Lift-Away Advanced Upright Vacuum with DuoClean Detect, Odor Neutralizer Technology, Anti-Allergen Complete Seal Technology, and a HEPA filter to deep clean pet hair while trapping allergens.