The Submarine wet roller head is designed to wash hard floors, effectively handling both wet and dry debris. Features a precisely angled blade of light that reveals twice the amount of invisible dust on hard floors, ensuring thorough cleaning. A built-in piezo sensor counts the number of dust particles passing through the inlet 15,000 times a second, automatically adapting suction power to the level of dust detected.The advanced seven-cell battery provides fade-free power for whole-home deep cleaning. Easily swap with an additional battery (available separately) for even longer cleans.Captures 99.99% of particles as small as 0.3 microns, including allergens, mold spores, dust mites, and pet dander, expelling cleaner air.