Thanks Don and Rob for your replies. The device I own is a PFG-100.
I assume just like my starter jump cable links that red is positive and black is negative.

Another question: I have been using one of the 6 or so prostate frequencies 4 days a week for about 6 minutes a session. On a fifth day I spend about 1/2 hour cycling through all of the frequencies (it spends about 1 minute then goes to the next). I am not sure if it is known which is more effective. It seems that focusing on one frequency at a time would be more likely to have the desired effect as 1 minute may not be enough time for the virus to be destroyed. Do Crane or Rife give any indication on this?

Thanks

Hap

Hap