I am start to using Good Knight Advanced Activ+ System one year and using still now then I write this review about this product.It is an electric product and using it on electric plug system board.At first I want to say it is very good product.I am also using Good Knight Neem Activ+ but Good Knight Advanced Activ+ System is best.The smell of this oil is very sweet and there are no side effects.I am using it specially for night for good sleep.It is help to out mosquitoes in my home and it is starting quick fight against dangerous mosquitoes when I switch on it.This system has two mode one is Normal mode other one is Activ+ mode .Activ+ mode fight against mosquitoes very quickly and Normal mode work slowly.