Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
TranyaGo 1.69 inch Full Touch Screen Real-time Heart Rate Multi-sport Modes 200mAh Music Control IP68 Waterproof Smart Watch – Black
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Coupons for TranyaGo Smart Watch? Nope, there’re no coupons in Banggood.
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): BGe46294, BG8eb338, BG2d3d28, BGSCHOOL8OFF, BG34743b, BGCAPITALOS8, BG8FORMULAMX, BGf57ad2, BG92f815, BG742c34
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for TranyaGo 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)).