The signal generated by the zapper has a square or rectangular shape. We can say that half the time it is at a certain voltage (eg 12 V) and half the time it is at 0 V. The frequency of this change determines the frequency of the signal.
The experience of dr. Hulde R. Clark and the experience of her users have shown that the duration of frequency therapies can be of varying lengths and also without interruptions. She helped her patients with many frequencies in such a way that she selected a set of several hundred thousand frequencies and raised the frequency by 1000 Hz every three minutes during several hours of therapy.

Due to the long duration of such therapies, she recommended for home use the use of the Zapper in three steps of 7 minutes with 20-minute breaks in between with a general frequency of 30.000 Hz. Research has given us exact frequencies to help with various disease states, parasites, viruses, bacteria, molds or symptoms. These frequencies are written in ETDFL (The Electro Therapy Device Frequency List). The frequencies are obtained from 12 clinics around the world, and they have given positive results on actual patients. With a device that can be programmed and used according to all ten frequencies for an individual diagnosis recorded in ETDFL, we can help each other in a much more effective and faster way. The device must also be simple and user-friendly. In this way, the use of more effective methods with several frequencies is no longer time-consuming, and there is no longer a need for a single frequency and therapies with intermediate breaks.
Zapper-Pro can be used with different electrodes.
According to our knowledge, based on the research of the medical team in Berlin (ETDFL.com) in conjunction with scientists and researchers all over the world, there is no universal frequency that works equally on all parasites and on all human organs. Zapper-Pro is a targeted device and can be programmed to any frequency we want.

The square signal emitted by the Zapper-Pro
Anti-parasitic program:
The zapper effectively destroys parasites, but it has a hard time accessing the well-hidden eggs or larvae in the body, which leave parasites everywhere. For maximum efficiency, we find the right frequencies from of the ETDFL list (for some parasites there are also frequencies to destroy their eggs). For the effective removal of parasite larvae and all remnants of unwanted parasites from the body, it is also recommended to use herbal preparations according to the instructions of Dr. Hulda Clark.