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Optical Fingerprint Reader Sensor AS608 (R307 or DY50)

Marsoni M251S
Sale price$425.00
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Get it in 3 business days with 1 day shipping. Friday, May 29
Optical Fingerprint Reader Sensor AS608 (R307 or DY50)The fingerprint module is an integrated fingerprint processing module integrating optical path and fingerprint processing. It features a small size, low power consumption, a simple interface, high reliability, fast identification speed, good adaptability of dry and wet fingers, and fast fingerprint searching speed. Hardware connection: Module via a serial communication interface, directly with 3. 3V or 5V power microcontroller communication: Module
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Bill
Battle Creek, US
★★★★★ 3
Three Stars
Will help you sleep.
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Reviewed in the United States on October 8, 2016
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Carley Rousse
Cuba, US
★★★★★ 5
Good
The only melatonin that works for me
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Reviewed in the United States on April 2, 2026
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N. Hannah
Waukegan, US
★★★★★ 5
Source Naturals Melatonin is the best!
My husband and I have been using Source Naturals Melatonin for almost 25 years. I have tried a few other brands, and I definitely think Source Naturals is the best! I once saw a program on Discovery channel about how Melatonin is an important heart antioxidant, and that after age 40 the Melatonin in our system goes way down. We had also just moved to a high altitude town, and I was having great difficulty sleeping because of the high altitude. We started taking Source Naturals Melatonin, and I was able to sleep like a baby. I really recommend the time release especially, and we also take a 1 mg sublingual lozenge to fall asleep more quickly.
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Reviewed in the United States on August 27, 2017
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Patricia Dodd
Alexandria, US
★★★★★ 5
surprised!
I actually didn't realize I had ordered "time released" version. I thought these were just normal melatonin. But now that I've tried these, I love them so much better than the regular version! Helps me sleep better through the night. No taste, love this brand of Source Naturals.
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Reviewed in the United States on October 17, 2025
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ChelaTho813
Lexington, US
★★★★★ 5
The only one I'll use!
As the title says, this is the brand to get!! It's fast-acting, doesn't give me weird dreams like some do, and I never wake up feeling groggy.
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Reviewed in the United States on March 13, 2025

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