Generateur Frequence is a one-product shop run by Tom Giraud in Arles, in the south of France. The product is a small electronic board that emits a sine wave and switches on at 7.83 Hz, the fundamental of the Schumann resonance: the natural electromagnetic resonance measured in the gap between the Earth's surface and the ionosphere.
What it is
An uncased circuit board with an LED readout and a keypad: type a number, press OK (K stands for thousand).A range running from 0.01 Hz up to 100 kHz.Two flat spiral coils, one printed on each face of the board.Powered from any 5 V micro USB source, for instance a phone charger or a power bank; the cable is included.
What it is not
It is not a medical or therapeutic device, and the shop makes no promise about how anyone may feel around it. Some people who keep a meditation corner simply like to have a frequency source running there as an object of interest; that is the whole idea.
Price: €59, free tracked delivery in 7 to 15 working days, 14-day withdrawal period. Details on the 7.83 Hz board page or at generateurfrequence.fr.