Customized Watch Face Support, Compatible OS Android 4.4 or above /iOS 9.0 or above, Model DT66, Female Health Management Support(Ovulation /Safe /Menstrual) /use on APP, Waterproof IP67, APP Name Wearfit2.0, “Battery Capacity: 180mAh Standby Time: About 10 days Using time: About 5 days Charging Time: About 2 hours Charging Type: Magnetic charging”, Operating Mode Full Touch+Press Button, Bluetooth Version BT 4.2, Brand DT NO.1, “Size: 1.09inch Type: IPS Resolution: 240*240pixels”.
Go down and check coupons out. Remember to check price history if it is available. 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.
Link: Banggood product page
1. ($32.26): BGc70579
2. ($32.26): BGbf11dd
apply it in your cart 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): BGc94b75, BG1cb3e0, BG3d3f40, BG51f436, BG54ec5d
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for DT NO.1 DT66 Smart Watch is here. The lowest price was: $15.99.
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)).