Product features: 1)Convenient and durable--don't need to change the liquid every day ,it can last for 30days(according to 10hours per day) 2)safety and hygiene--with good quality's prallethrin, more safe 3) Fresh fragrance--gently and no irritating. 4) Screw cap design, so that the liquid is securely installed ; 5) Leak proof stopper, less volatile Direction for use 1.Unscrew the electric mosquito liquid bottle. 2.Make the bottle within the Insect repellent tightly 3.Powering, press the switch.As soon as the guiding light is bright,it is working 4.If replace the liquid, firstly cut off the power and then to cool before replacing