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.
Go down and check coupons out. Remember to check price history if it is available. What is the best price?
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. ($51.07): BGc70579
2. ($51.07): BGbf11dd
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGKPROCK, BGNYROCK, band10, BGSEArock, BG3ROCK, BGKSROCK, BGWRIBAND10, BG8ea462, BG20aef5, 6GSGIT, BG81ef26, BGaae78b, BG51f436, BGa30930, BGfa96ff, BG3bd1cb, BG2202FANS12, BGa32675, BG6eb515, BG95aa1e
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Kospet Rock Fitness Tracker [EU] ($-3)
Price history and price alert
Price history (for all/most countries) for Kospet Rock Fitness Tracker is here. The lowest price was: $30.99.
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)).