This is from the Thiel report: “Two different zappers were used: A commercial model and a specially engineered model. The commercial model used was a SyncroZap Pulse Generator Model B3 from Self Health Resource Center, Imperial Beach, California; it is operated by a 9 volt battery and produces a 32KHz output. The engineered model was based upon the same design as the commercial model (was also operated by a 9 volt battery), but due to an extra integrated circuit, its output sweeps the frequency in steps of 2KHz from 20-40 kHz “
The Parazapper outputs either 30KHz or 2.5KHz. I highly doubt that the 2.5KHz gives very much different results.