Name: Schumann wave very low frequency generator Frequency: 7.83HZ Power: 0.5W Product diameter about: 8.5CM Product height about: 1.9CM Product weight: 110 g Built-in 1000MHA battery, one charge takes about 1 month Output waveform: square wave The blue light is flashing, the normal transmission state (normal work) Red light on, charging Green light on, fully charged. If the switch is about to work, all the lights are off, indicating that the battery is low and needs to be charged. German physicist Schumann pointed out that the earth's surface and the ionosphere form a resonant cavity with a very low frequency, and the resonant frequency is 7.83HZ. The wavelength of the Schumann wave resonance frequency is just equivalent to the circumference of the earth, which is about eight to ten hertz in frequency. The human brain nervous system also has a coordinated response to the frequency of the electromagnetic pulse of the Schumann wave, To supplement the energy of human cells, human health depends on natural energy and physical and mental balance. The actual nature is a multi-spectrum combined waveform, so the 7.83HZ sine wave cannot restore the Schumann wave on the earth. The 7.83HZ square wave is composed of 7.83HZ and its subharmonics after being decomposed according to the Fourier transform, which itself contains the harmonics that exist in nature. inside, so the square wave is closer to the natural state