HSP, Microphone Yes, bluetooth protocol A2DP, 3.7V, Talking Time 100h, AVRCP, Transmission Distance 10m, bluetooth Version V5.0, Battery Capacity Charging box: 2200mAh, Earphone: 43mAh*2, Charging Time (h) 1.5 hours for earphone, 3.7V, HEP v1.6, 4 hours for charging box.
Basically copy coupon, view price history or create e-mail price alert. 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 China.
Link: Banggood product page
1. ($42.20): BGBRPL2
2. ($42.20): BGHOTSHOP15
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): AFfbG10, BGT1599, BGVDay10%off, EARSP11, bGhOnEy10, BG20HAY, BGITHAYLOU, BGT15011, bgshOOp10, BGELIG0920, BG11SHOP, HAYLOU15, BGLOAC1, 13f142, BGa0b145, BGBuscape01
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Haylou T15 Bluetooth 5.0 Earphones is here. The lowest price was: $20.99.
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)).