| Brand | Unbranded |
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Check the listing for details. Schumann Wave Generator FM783 With USB Cable 5V 0.1A Ultra-low Frequency. Condition: New. Listed at 5.10 USD. And everyone has a weak potential network, excited by Schumann waves, it will produce frequency resonance, and the strength of its resonance is related to the internal structure of the electrical network (human body).
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