Charging Time: about 2 hours, Standby Time: about 20 days, Charging Type: Magnetic charging, Using time: about 7-10 days, Battery Capacity: 180mAh, Waterproof IP68 Deep Waterproof, Bluetooth Version BT 5.0, Type: IPS, Size: 1.3inch, Resolution: 240*240pixels.
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Aliexpress
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Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
1. ($19.99): BG2cde7d
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): BG2BWHL3, BGBW152, BG5BWHL3, band10, BGBWHL3, BGSS10%SW, BGSHL3, 1664886, BGEHL3, bgshOOp10, BGSBWHL3, BBGEHL3, BG9HL3, BGCZHL3, BGRMBWHL3, BG11SHOP, BGPHL3, BGE2HL3, BGE1HL3, BGERHL3, 10%ForNewBW, BGGHL3, BGTUSPO2, BGSPHL3, BGCuponation10, BGM3HL3, 10%ForBGBW, BGBHL3, BG22C8E5, BG156a95, BG85c8f9, BG30bc0d, BG9736b2, BG4a80cf, BGJOPO1, BGWRIBAND10, BG7a4ec3, BG77HL3, BG140eff, BGc2be70, BG3288c3, BG01d30b, BGc70579
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for BlitzWolf BW-HL3 Fitness Tracker. The lowest price was: $19.99.
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)).