Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
Waterproof IP68, Serise RT2, APP Name Haylou Fun, Compatible OS Android 6.0 or above; iOS 11.0 or above, Bluetooth Version BT 5.0, Model LS10, Operating Mode Full-Touch, Brand Haylou
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($22.99): BG736b82
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGc70579, BGHYRT2, BGHU1618, BGf3815a, BGHOBBY22, BGJP0066, BG678c97, BGc95ca2, BGbf11dd, BG508452, BG115483, BGd1cba2, BGMARCHSALE, BGbc4460
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for Haylou RT2 LS10 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)).