You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
NFC: integrated circuit card, 16 sectors (0 – 15), APP: Da Fit, Chip: NRF52832 QFAA, Heart rate sensor: dual PPG Heart Rate Sensors Module HRS3300, G-sensor: BOSCH BMA421, 13.56 MHz, NXP MIFARE1 / S50
Aliexpress
There’re some similar (or not) items on Aliexpress
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Price history and price alert
Check out price history chart (for all/most countries) for Alfawise H19 Smart Watch Black.
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)).