I used a zapper on a neighbor with schizophrenia in 2021. One month later he told me that he had had a delusion about every other day. After I started the one-hour treatment, he said that he had no further delusions. My zapper is model Z4eX. During the recent two years, Gooogle found this zapper from only the model number.
This is my favorite zapper. I used the lowest speed. However, I feel that any parasite zapper will work fine.