most mature and popular air cleaner CE, GS, (c)UL and RoHS approvals The combination of multi-filteration process helps to control various airborne contaminant Pre-filter: absorbs large-size particulate, and help to prolong the life of inner filters HEPA filter: trap dust, particulate and dust Photocatalyst filter: help to eliminate household harmful gases and VOCs Negative ion: combine small dust and particulate and supply comfortable air similar to forest Speed control: low, medium, high, three different speed for different environment and time Timer control: the machine can be switched off automatically in 2, 4 and 8 hour interval Works manually or automatically Negative ion: ≥3,000,000ions/cc Effective area: 20 square meters Noise: 25dB HEPA working period: two years (12 hours each day) Dimensions: 250 x 180 x 300 mm Power: 100 to 230V, 50 to 60Hz, 40W