MIO PAI Function, Waterproof Design, Pedometer, Sedentary reminder, Heart rate monitor, Sleeping monitor, Alarm setting.
Just check coupons out (with price alert and history). Let’s see what best price is ATM.
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 code price check (UTC time):
Banggood
Banggood warehouse is located in China. We have found one coupon for this product!
Link: Banggood product page
1. ($29.54): band10
just apply this code 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): 502C6B, TTxBG10, 10lenovo, BG3CSUM, AFfbG10, BGBFAFF2019, BGLENOVO20, BGBGAFF10OFF
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Lenovo HW01 Plus Smartband is here. The lowest price was: $15.47.
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)).