Dr. Hulda Clark recomends that 11 features should be on a zapper
1. 100% Duty Cycle.
2. Super Stabilized wave.
3. Constant high voltage.
4. Pure square wave.
5. Constant high current.
6. Footpads.
7. Low frequency.
8. Superior harmonics.
9. Blood electrification.
10. Electroporation.
11. Aura expansion.
ive been on all the zapper websites all over the place and there is only one that i have come across that has all of the 11 features and thats the ultimate zapper by a chap called ken presner some of the zappers have none some have one or two i think the most i found was 4 or 5 i must admit the ultimate zapper aint cheap in uk its about £190 or round about $190 dollers thats with the lot footpads etc just be carfull cause a lot of these zapper are just snake oil check this out a hell of a lot of infomation http://zap.intergate.ca/index.html
if i could afford the ultimate zapper thats the one i would go for hands down and it comes with a life time warranty and try it for 3 months in not happy send it back and get a refund how many other zapper would do that prob none thats unhurd of happy hunting guys dont get stung!!!!!!!!