Price history, coupons and price alert are available on this page. You probably want to know what is the best price?
Battery Capacity: 200mAh, Brand DOOGEE, Charging Type: 2-Pin Magnetic Charging, Model CS1, Size: 1.4 inch, Waterproof IP68 (not available for bathing / sauna and diving), Camera Control Support, Music Control Support, APP Name Da Fit, Type: TFT, Resolution: 240*240 pixels, Charging Time: About 2 hours, Heart Rate Monitor Support, Using time: About 14 days, Sleep Monitoring Support, bluetooth Version BT 4.0
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 and price update (UTC):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
1. ($34.03): BGc70579
apply it in your cart 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): BGC1DGCS1, BGCuponation10, band10, BGWRIBAND10, BG084891, 6GSGIT, BG51f436, BG2eb8aa
(probably won’t work, but you can try them out)
Price history and price alert
Do you need price history chart (for all/most countries) for DOOGEE CS1 Fitness Tracker? There we go.
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)).