Brand HIPEE, Weight 62g, Relative humidity ≤80%R.H, Color Black / Red, Charging time 1.5 hours, Power supply Internal power supply, Communication method bluetooth 4.1 or higher, Neck circumference 34-43cm, Software version Support IOS6.5.8 / Android 6.5.7 or above, Working hours 90 hours, Rated input 5V 1A, Temperature -10-55℃, Size 137x167mm.
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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 China.
Link: Banggood product page
1. ($18.99): BGc94210
2. ($36.54): BGTS666
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): BGwhielabel, 13f142, BG10OFFAFF1, BGba7bf6, BG3caf1e, BG8b1335, BG4e47f0, BGAlerabatdo, BGf8ec36, BG3bd340, BG716337, BG7f1811, BG267e3b, 2022ACTIESNL, Terence, BG1efeb0, MVC8SPRING, 8BGwbg2204, BG9f0c54, BG31483b, 8wEbgaInS5, pROMo8cuPoN, BG397e35, BGe6e89b, BGHOM119, BGsmartbuyU1
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for HIPEE Smart Back Posture Corrector? There we go. The lowest price was: $18.99.
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)).