good point. With a blood electrifier anything from DC to 100 hertz is effective. It is almost completely independent of frequency. That is the beautiful simplicity of it. I've been into electromedicine since 1996 and am definitely skeptical of all frequency devices although I am aware of some exceptions to my skepticism. Beck was right in saying that the 30KHz clark Zappers "don't work". I used to make and sell them but stopped because they were ineffective. Same with the Rife/Crane devices. People don't realize that the "Rife Frequency List" only has a few frequencies from Rife himself. All the others were from various people, some good researchers and some complete crack-pots. There is nothing scientific at all about the Rife Frequency List.