bluetooth Version V5.0, 3.7V, Standby Time 25h, Impedance 32Ω, Receive Sensitivity 110dB, Earphone: 43mAh*2, bluetooth Chip Realtek8763BRC, Working Time (h) 3-4h, Frequency Response 20-20kHz, Transmission Distance 10m, Microphone Yes, Charging Time (h) 1.5h, 3.7V, Battery Capacity Charging box: 380mAh.
Price history, coupons and price alert are available on this page. 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 and price update (UTC):
Banggood
Banggood warehouse is located in Europe 
. I don’t know if this is a good price – number of records in my database is too low!
Link: Banggood product page
1. ($25.51): BGAFF10OFF
2. ($25.51): BGTT10
3. ($25.51): bGhOnEy10
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGGT2, 502C6B, BGGT2DE, BGGT222, BGGT2PL, BGGT233, AFfbG10, BGGTXM2, BGGT2BF, BGGT277, BGTWS20, BGGT2CF, BGVDay10%off, BG20TWS, BGGT202, BG20HAY, bgshOOp10
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Haylou GT2 TWS Earphones ($-3)
Price history and price alert
Well, you won’t see price history chart, coz we have only 1 database record for this item (and price was $20.99).
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)).