Is the insecticide (pyrethrins) inhalation of paper, the use of hot air evaporation of pesticides, the general efficacy can be maintained for 6 to 8 hours.
The disadvantage is that when the use of good efficacy, there may be "excessive" of the risk, but 4 to 5 hours later, the pesticide volatile, the effect is poor, anti-mosquito effect weakened.
The use of capillary principle, continuous heating the release of insecticide material liquid mosquito coils, just to make up for the shortcomings of electric mosquito coils. Liquid mosquito coils can be used for a long time, about 60 days or so, or even regular release.
Half an hour before going to bed, is a good time to use electric mosquito coils. When used doors and windows closed, people and pets have to leave.
Mosquito coils are divided into electric film mosquito coils and electric liquid mosquito coils two kinds, they are the use of the heating element of the thermostatic effect of the slow release of drugs, volatile gas to mosquito repellent.