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The product not only can output 7.83Hz Schumann wave, but also can adjust the frequency in the range of 0.1Hz ~ 30KHz, digital circuit crystal oscillator frequency reference, more stable, stronger anti-interference.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.