Using time: About 10days, Battery Capacity: 340mAh, Size: 1.28inch, Waterproof IP68, Band Size: about 22mm, Charging Time: About 2hours, Product Weight: about 57g, Charging Type: Magnetic charging, Standby Time: About 25days, Resolution: 240*240pixels, Dial Size: about 46mm, Type: TFT.
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 price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($46.72): BGc70579
2. ($46.72): BGbf11dd
paste coupon code in your cart and click Apply 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): band10, bgshOOp10, BGHALLOWEEN, BG11SHOP, BGCuponation10, BGWRIBAND10, 6GSGIT, BG51f436
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for KINGWEAR KW35 Fitness Tracker. The lowest price was: $20.76.
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)).