SIM Card Independent Standby / Hand-free Call / Nano SIM, Battery Capacity 900mAh/ Power Bank 900mAh, Memory DDR3 4GB / EMMC: 128GB, 5 million HD pixels（Side Camera), CPU MT6762 8core, Touch Screen 1.6 inch HD round touch screen, Resolution 400*400 Pixel, Camera 2 million HD pixels（Front Camera).
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Aliexpress
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Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($285.65): hoNEYbGdeAlS
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): BGLEM18922, BGLEM15, BGSWATCH10, BGLEM153, BGLEM1503, BGNTHMA, BG4a5413, BGa522cd, 6GSGIT, BG621c0f, BG20e3b6, BGcbe03d, BGBF1117, BG9c79c5, BG029716, BG51f436, ADMITAD2212, BG1efce1, BGLEM15FANS, BG2202FANS18, 2203ActiesNL, BGfbdb26, MVC8SPRING, BG0a8381, pROMo8cuPoN
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for LEMFO LEM15 4/128GB Smart Watch. The lowest price was: $172.99.
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)).