“Size: 1.36 inch, Standby Time: About 10-15 days, Type: IPS, Steel. PU Leather, Chipset RTK8762D, Waterproof IP68 Waterproof, Using time: About 4-5 days, Pixel: 390*390 Pixels”, Charging Time: About 3 hours, Model DT3, Case Thickness: About 11.5mm”, Band Width: About 22mm, ECG Heart Rate Monitor Support, “Diameter: About 45mm, bluetooth Version 5.0, “Battery Capacity: 280mAh, Charging Method: Magnetic”, Brand DT.NO1.
Price history, coupons and price alert are available on this page. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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.
Link: Banggood product page
1. ($56.22): BGc70579
2. ($56.22): BGbf11dd
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGDT03, 6GSGIT, BG011f9a, BG51f436, BG94322e, BG3122d7, BGDT3FANS, BG2202FANS13, BGaa54dd
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Do you need price history chart (for all/most countries) for DT.NO1 DT3 Smart Watch? There we go. The lowest price was: $29.99.
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)).