This setup works in a pretty simple fashion. On the first machine you have whatever it is you want to use as the battery source such as the sun. Then, on the second machine you have a spirit that is super beneficial for protection. Finally, you place on the last machine a spirit that is used as the killer.
The whole operation when set into place is a way to continually have protection in your everyday life and keep away issues that "could '' arise. With the continual protection as well as stopping issues down the line that could occur this device is a must.  Especially if you are in the magick field since not only do you get constant protection, but doing weekly spiritually cleanse will be then unneeded.