★★★★★ 5
Works for the rest and sleep I need.
Gives me a restful sleep.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 7, 2025
XAOC Devices Koszalin 1964 Stereo VC Frequency Shiftor
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
XAOC Devices Koszalin 1964 Stereo VC Frequency ShiftorKoszalin is a 10hp full stereo frequency shifter (2 ins 4 outs) offering both quasi exponential and linear frequency change of up to + 5kHz as well as full stereo feedback under voltage control. Frequency shifting results in linear translation of signal spectrum producing all kinds of atonal sounds. It should not be confused with frequency scaling, also known as pitch shifting. Complex phase cancellation patterns occurring with frequency shifting and
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.7 ★★★★★
Based on 2040 reviews
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Product Reviews
★★★★★ 1
Do not buy
Cheap, but tastes bad. I guess it worked but I tossed a big bottle of it and got the higher price Spring Valley 10 kg melatonin which works well. The taste is great (strawberry) and highly chewable.
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Reviewed in the United States on March 12, 2026
★★★★★ 5
Got it
They are good vitamins. Thank you
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Reviewed in the United States on October 19, 2025
★★★★★ 2
not happy it said gummies that why l bought them
this product said that they were gummy’s but they’re actually chewable tablets. I can’t eat tablets. I’m very disappointed that it said gummy. That’s the only reason why I bought it.
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Reviewed in the United States on March 10, 2026
★★★★★ 4
Not as effective
I don't find the chewable as effective as the ones that dissolve. These don't seem to give me the same relaxing quality.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 30, 2025
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