V2.0 FM783 Tubo Schumann Wave 7.83HZ Generatore di impulsi a bassissima frequenza + alimentatore
1PC V2.0 Tube FM783 Schumann wave Ultra-low Frequency Pulse Generator. The Schumann resonance spectrum is in the ELF band with a frequency of around 8 Hz (this value is much higher, 7.83 / 7.5 / 7.2, etc.).