3.7V, Working Time (h) 8h, bluetooth Chip QCC3026, Charging Time (h) 2h, Transmission Distance 10m, 3.7V, Earphone: 60mAh*2, Standby Time (h) 180h, Frequency Response 20-20kHz, Battery Capacity Charging box: 600mAh, Impedance 32Ω, bluetooth Version V5.0, Microphone Yes.
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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 Europe 
. I can’t tell you if this price is good – not enough records in my database, so I won’t judge. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($38.99): 13f142
apply code in your basket (cart) 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): BG20QCY, TTxBG10, aff7off, BGkonimbesinT3, BGT3, BG3CSUM, bgssaff9, AFfbG10, 502C6B, BGCITYADS2019, BGQCYT3CF, BGT3377, BGQCYT3, BGVDay10%off, EARSP11, BGTT10, bGhOnEy10, bgshOOp10, BG11SHOP, BGSK801, BG4BW25, BGLOAC1
(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
It doesn’t make sense to generate price history chart, because there is one price record which is: $29.99.
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)).