bluetooth Version V5.0, Impedance 32Ω, Frequency Response 20-20kHz, HSP, AVRCP and A2DP, Battery Capacity Charging Box: 800mAh, Microphone Yes, 3.7V, Working Time (h) 4h, Bluetooth codec: SBC, Chipset RTL8763BFR, Support profiles HFP, AAC, 3.7V, Earphone: 43mAh*2, Charging Time (h) 2h, Standby Time (h) 120h, Talking Time 4h, Transmission Distance 10M.
You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
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.
Link: Banggood product page
1. ($40.03): BG11SHOP
2. ($40.99): BGSS10%SW
put item in your cart and apply coupon code there 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): BG20QCY, TTxBG10, BGQCYT2S, BG3CSUM, AFfbG10, BGT2SZ, BGT2SDE, BGQCYT2SS, BGQCYT2S99, 502C6B, BGCITYADS2019, BGT2S77, BGVDay10%off, EARSP11, bGhOnEy10, bgshOOp10
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for QCY T2S TWS Earphones. 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)).