Resolution: 240*240pixels, Charging Type: Magnetic charging, Battery Battery Capacity: 350mAh, Standby Time: About 50days, Screen Size: 1.3 Inch, Type: TFT Color Screen, Using time: About 15days, Sensor BMA253, Charging Time: About 2hours.
Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
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 code price check (UTC time):
Banggood
Banggood warehouse is located in China. I have no active coupons for you right now.
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!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): S1027, band10, 502C6B, TTxBG10, bgs10, AFfbG10, bgdt15, BGAFF10OFF, BGDTS1027, BG11SHOP, BGWRIBAND10
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for DT NO.1 S10 Smart Watch. The lowest price was: $27.99.
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)).