I’m  always like doubting Thomas, I have to see to believe. I did last week when I had an allergy sinus coming on, had an awful headache. I sat down and used the zapper, and within a few minutes the headache I had had all day ceased. I then got a bath..and later that evening to be on the safe side, not to have this sinus spread to bad, I again zapped..and that evening slept very good. Today I will again get a bath, and go ZAP!..praying that it works for whatever in inside me that needs to be taken care of.  Miz Judy