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Perfusion index monitoring, 6 different display modes, One key to change the screen style, Hang rope design, 8 hours sleep monitoring function, OLED screen display, easy to carry, Power supply: 2x AAA battery (not included)
Aliexpress
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Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $9.99.
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).