Model S30, Charging Time: About 2 hours, Battery Capacity: 360mAh, Standby Time: About 60 days, Using time: About 7 days, Resolution: 240*240pixels, Compatible OS Android 4.4 or above, Waterproof IP68, Charging Type: Magnetic charging, APP Name F FIT, Type: TFT, Dial Size: about 47*47*13mm, Bluetooth Version BT 5.0, Product Weight: about 48g, Size: 1.3inch, Customized Watch Face Support, iOS 9.0 or above, Operating Mode Full Touch+Press Button, Band Size: about 212*22mm.
Go down and check coupons out. Remember to check price history if it is available. You probably want to know 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 Europe 
. Uhm… There’s no price history (in my database) for this product right now.
Link: Banggood product page
1. ($29.69): band10
2. ($29.69): BGWRIBAND10
3. ($31.99): 13f142
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGSEN30, BGSS10%SW, BGPLS30, BG2SEN30, 6GSGIT, BG51f436, BGc70579
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – SENBONO S30 Fitness Tracker ($-3)
Price history and price alert
Well, you won’t see price history chart, coz we have only 1 database record for this item (and price was $18.99).
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)).