I have shifted to Mumbai 6 months ago and stay in Andheri (E), from the very 1st day in Mumbai I had experienced fierce bite of big terrible mosquitos welcoming me in Mumbai, and so the search to prevent that started, I went to the local chemist with my problem, he instead of giving me the best, showed me all the brands with free offers, but to my fortunate one kind lady was standing there watching me surfing all the packs of repellent, she just pick Good Night and said, buy this and see the diffarance, and she was right uptill this date all the nights I had not been attacked by any mosquito whatsoever, this machine is just fabulous, and really effective, and I also truly agrees with the advertisement they had made on T.V.