Connecting interface: 3.5mm, Driver unit: 6-10mm, Frequency response: 20 – 40KHz, Impedance: 24ohms, Sensitivity: 108dB.
You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
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. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($25.26): BGBuscape01
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): TTxBG10, aff7off, 2019SPEDM, BG3CSUM, bgssaff9, AFfbG10, 502C6B, 0e7f33, FBCOUPON1, BGLOAC1, 13f142, BGa0b145, BGBRPL2, BGHOTSHOP15, BG53e9c8, BGAlerabatKL
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. China – TRN V20 Earphones Black ($-3)
2. China – TRN V20 Earphones Gray ($-3)
Price history and price alert
Here is price history (for all/most countries) for TRN V20 Earphones Red. The lowest price was: $14.83.
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)).