Water filtration vacuum cleaner retains almost 100% of dust. It's not only just a vacuum cleaner but also a humidifier and atomizer. Here are specifications: suction(max):220 w, max vacuum: 20 kpa. Noise level is under 75 db. Capacity is 4 l. Cert. :emc, gs, pah, sccp, rohs. Sale points : a) 6-layer filtration system ensures retaining 100% dust, and 13 hepa at air outlet makes sure that air is purified. B) useful blower function. C) automatic cord rewinding. D) tool storage on board is more convenient.