Basically see you purchase electric mosquito repellent liquid composition and concentration.On the market of electric liquid mosquito-repellent incense belongs to toxic products, toxic ingredients and concentrations can lead to different product sizes, some WeiDu, some lower toxicity.But all fall within the scope of the national standard of safe use.Not recommended in infants and young children to use inside the bedroom.Best buy special liquid mosquito-repellent incense.Adults are just as well.