Hello Friend this is Anurag.Mortein Mosquito coil killing the mosquito.Mosquito borne disease rate are very high Mosquito coil are very effective of the disease transmited mosquito is the greatest manace.A mosquito coil covered more effective in room for long time.Mortein power coil duration time eight to ten hour, result are good against insects.Mortein are use very easy its on round figure covered 15 centimeter.I also use many time but sigh effect are very high all type coils produce smoke who are very harmful they shows sighn of serious irritation from the high smoke concentration but there are no adverse effect on other part of the body, always windon open when use Mosquito coil.the prize of 30rupees on childhood are more harmful.Thanks