Price history, coupons and price alert are available on this page. You probably want to know what is the best price?
Charging Type: Magnetic Charging, Compatible OS Android 5.1 or above /iOS 10.0 or above, Size: 1.69 inch, Bluetooth Version BT 5.0, Operating Mode Full Touch, Model Rock, Using time: About 14 days, Multi-sport Modes Support(20 Kinds Sport Modes), Charging Time: About 2 hours, Type: TFT, Customized Watch Face Support, APP Name DaFit, Resolution: 240*280, Brand Kospet, Battery Capacity: 350mAh, Standby Time: About 50 days
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 code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($51.07): BGc70579
2. ($51.07): BGbf11dd
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGKPROCK, BGNYROCK, band10, BGSEArock, BG3ROCK, BGKSROCK, BGWRIBAND10, BG8ea462, BG20aef5, 6GSGIT, BG81ef26, BGaae78b, BG51f436, BGa30930, BGfa96ff, BG3bd1cb, BG2202FANS12, BGa32675, BG6eb515, BG95aa1e
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Kospet Rock Fitness Tracker [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for Kospet Rock Fitness Tracker.
Price records source(s): Gearbest, 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)).