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2 AAA batteries, Large LED display (1.1 inch)
Aliexpress
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Price history and price alert
Price history (for all/most countries) for COZZINE FS10E Fingertip Pulse Oximeter [CN-59] is here.
Price records source(s): Gearbest
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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)).