... Room Air Purifiers up to 430sqf, 11w, auto function, need no filters or drugs, remote contral, time-fixing,fashionable design Room Air PurifiersUp ... to 40 sqms(430 sqf), 11w, auto function, need no filters or drugs, remote ... Micro-computer controlAutomatic sensing and cleaningLower operation cost: no filters, drugs or other parts needed, 3 days` running ...