Charging time(charging case) about 2 hours, Charging interface Type-C, Wireless connection bluetooth 5.2, Brand Haylou, Support protocol SBC/AAC/A2DP/AVRCP/HFP/HSP, Communication distance 10 meters (barrier-free open environment), Battery capacity(charging case) 310mAh, Model GT7, Battery capacity(single earbud) 35mAh, Battery life About 20 hours (with charging case), Charging time (earbud) about 1.5 hours.
Price history, coupons and price alert are available on this page. 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 coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood.
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): BGGT7W, BGGT7TR, BG8bbf5e, BGGT7D, BGHOTSHOP15, BG657550, BGHU1566, BGAlerabatKL, BG07d93f, BGa9eeb7, BG0c5ab2, BGd173b4, BG48a031, BGAudioVideo, BGAUDIO, BGcf759c, BG9ba0e8, BG1b5830
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Haylou GT7 Bluetooth V5.2 Earphones? There we go. The lowest price was: $13.99.
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)).