There are two kinds of common mosquito coils, electric mosquito-repellent incense and mosquito coils. Electric mosquito-repellent incense almost smokeless, released into the air after heating particles is very small, less harmful to human body, is suitable for sealing good space. Electric heating coil and a chip and liquid two, effect is close. When using chip mosquito-repellent incense, can be placed on three or four drops of water, heating after more volatile active components. Release of disc mosquito-repellent incense smoke is larger, the combustion particles are big, will give the user the feeling of passive smoking, so relative to electric mosquito-repellent incense, harm to human body is big, but it is better to kill mosquitoes, suitable for barrack poor impermeability, such as open or half open space use. Use mosquito-repellent incense, it is best round with a few brands, like a mosquito is not easy to produce resistance. But beware, mosquito-repellent incense to be put away from 1 meters outside the human body when sleeping best put mosquito-repellent incense on foot, because if put too close to the position of the head, easy to breathe.

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