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Aliexpress
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IP67 Waterproof Bluetooth 4.0 Heart Rate Monitor
Price history and price alert
Price history (for all/most countries) for Xiaomi Amazfit A1603 Smartband [Fast-08] 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)).