We are a trader and seller of the Sacred Frequency Generator – Schumann 7.83 Hz board. This compact board produces Schumann resonance 7.83 Hz and includes 432 Hz and 528 Hz presets, adjustable 0.01 Hz to 100 kHz with a pure sine output. It has two silent coils, a 3.5 mm output, a keypad and LED display, and uses Micro USB 5 V power. The listed offer includes free worldwide shipping and 14-day returns. Our product information is available at https://sacredfrequencygenerator.com/product/sacred-frequency-generator/. Company website: https://sacredfrequencygenerator.com.