We have used all kind of mosquito repellent but never faced any difficulty what we have faced with this particular type of Machine.
First of all this machines works on electricity and does not come with an Auto stop switch and hence one fine day if you forget to switch it off then your money will be wasted for no use.
They claim that we can use Power Mode on if there are lots of mosquito but the truth is that t only works if we use it with all doors closed. Otherwise its effects are as good as none with open doors.
It also gives headache if someone continuously stays near to the machine. I have no idea how much this machine is safe for use and no information is provided on the machine also. One more thing which I noticed is that the machine never works for 30 days and last long only 22-23 days. I am not satisfied with the machine and prefer coils and papers over this.