Standby Time: About 10 days, Bluetooth Version BT 5.0, Resolution: 390*390pixels, Using time: About 5 days, Charging Time: About 2 hours, Charging Type: Magnetic charging, Battery Capacity: 260mAh, iOS 9.0 or above, Compatible OS Android 5.1 or above, Size: 1.2inch, Type: AMOLED, Waterproof IP68.
Just check coupons out (with price alert and history). 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 coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
1. ($61.24): BG51f436
coupon code has to be applied in shop’s 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): band10, BGKW11, bgshOOp10, 7d18f7, BGAFF10OFF, BG11SHOP, BGCuponation10, BGWRIBAND10, 6GSGIT
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for KINGWEAR KW11 Smart Watch is here. The lowest price was: $45.99.
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)).