charging box 380mAh, Bluetooth protocol: A2DP, HSP, AVRCP, Transmission range: 10 meters, Battery Capacity (mAh): Single earphone 43mAh, Bluetooth Version: V5.0, Headset, HFP, Charging Time: 1.5H (both), Bluetooth mode: Hands free.
Just check coupons out (with price alert and history). What is 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 coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. Coupons for Haylou GT2S Bluetooth Earphones [EU]? Nope, there’re no coupons in Banggood. This is new product in my database, so I don’t know if this price is good.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGGT2S, BGGT2SAA, BGGT2SCC, HAYLOU15, BG470, BGLOAC1, 13f142, BGa0b145
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Haylou GT2S Bluetooth Earphones ($-3)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $21.24.
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)).