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Operating Mode Full Touch Screen, Brand Haylou, Battery Capacity: 220mAh, APP Name Haylou Fun, Compatible OS Android 6.0 or above; iOS 11.0 or above, Model GST, Chipset RTL8762C, Bluetooth Version BT 5.0, Size: 1.69 inch, Using time: about 9 days, Resolution: 240*280, Motion Sensor / Heart Rate Sensor / Blood Oxygen Sensor, Standby time: about 20 days, Type: TFT, Charging Type: Magnetic charging, IP68, Charging Time: about 2.5 hours
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. Hmmm… There is no active coupon in Banggood at this moment.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGBRHAYLOU, BG19b0a6, BG11ANV06, BGHU1311, BGa1ee58, BG826439, BG72ba3e, BG51f436, BG34dd7b, BGf90b46, BGHU1526, BGSFANV18, BGSFANV19, BGb2e1f8, BGHU1784, BG263060, BGa54ae0, BGcb60ef, BGHU2065, BGc70579, BGe81a84, BGce1892, BGbf11dd, BGHOBBY20, BGJP84, BG8a31e9, BG42b532, BG2ac8af, BGHU2313, BG77aea7, BGd8dcc2, BG4306b2, BGb1f173, BG3a1487, BG0bb5ce, BG7b7278, BG0bf3fe, BG361f35, BG88e832, BG4825fa, BG73454d, BGCAPITALOS8, BG8FORMULAMX, BG9026b9
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Haylou GST Smart Watch [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for Haylou GST Smart Watch.
Price records source(s): Banggood
Click on image to enlarge. 
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)).