I have the zapper with 9 volt, on and off button Mini Zapper 30,000. I've been using it. I feel "uplifted" after it's use. I only have the handheld copper, will be getting footpads. I am experimenting with putting handhelds in different locations. Been cleansing for four months now, die off not bad at all. Still have faint biting. This morning a spot where I had a "knot" something burst...Can't imagine what's going on inside. I've counted so far about 9 pieces anywhere from 6-7 inches. One time expelled 3 pieces..8", 15" and 18 inches at one time. Still have a lot to do. Unbelievable stuff!