Thank you kindly for your response. I am reminded again that the universe is user-friendly:-).
I am puzzled about the candle part. I am not sure where to find such a gizmo. I do get the idea of what you mean though. The other question is about the 5 - 7 cm distance. Do you mean the distance between the 2 wires?
The box that came with the set is a zapper with a plug in for the double silver wire attached to a cable. The box runs on one 9v battery. Is the 9v going to be adequate?