Without a stabilized wave any device calling itself a zapper is not a true zapper. The Ultimate Zapper is the only true zapper available, with the exception of David Amrein's Super Zapper 2006 DeLuxe which is marketed as a frequency generator, not a as a zapper.
The higher constant voltage of The Ultimate Zapper adds to its ability to penetrate deeper into tissues. The fact that its voltage remains constant at 10.5 volts and never declines is a tremendous plus. It has 8 additional features that make it far superior to any other zapper available.
There are over 80 testimonials in the testimonial archive that bear witness to the superior effectiveness of The Ultimate Zapper.
The bottom line is results. There is no other zapper site in the world that provides all the documentation of effectiveness that I do on my site.