| Brand | Unbranded |
|---|
Check the listing for details. 7.83Hz Schumann Wave Pulse Resonance Generator Ultra-Low Frequency USB Type-C. Condition: New. Listed at 5.39 USD. Resonant frequency: 7.8HZ (adjustable). Improve sound quality, deep sleep with water quality. With high precision and good stability. We will try our best to avoid any quality problem.
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