I bought the hudla pro zapper. Put it on cw and rosemary the required group. I used it last week for a severe inflamation. It took 2 hours before I improved. So 2 hours means it somehow con time uses to effect your body long after you switch it off 10 hrs or more. 2 hours I stead 3 days of pills and waiting for improvement. Does that answer your question? BUY IT!