Friends nearly 5 months ago i bought philips air purifier in amount of 5600rupees. But after purchasing this i came to know that it is not so good as i think. It does not clean a lager area. It can clean the room which size is up to 63m square. It has night sensing mode. It also has special auto purification mode effectly removes pollution. It is certified by ECARF and airmid. It has 1 year warranty also. But it is expensive also with respect to its work. So i shall not recomend you to buy that air purifier.