Mic Sensitivity: -38±3dB, Impedance: 32Ω±15%, Mic Dimension: 4.0×1.5mm, Sensitivity: 105±3dB, Driver Diameter: 50mm, Headset Interface: USB, Cable length: 2.2M, Headphone Size: 200x88x230mm, LED Working Voltage: 1.8-3.4V, Headphone Weight: about 400g, Mic Impedance: 2.2KΩ, Frequency Range: 20-20000Hz, Power: 50mW.
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Aliexpress
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Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($46.99): BGfjsk
2. ($49.09): 7d18f7
apply it in your cart 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): de6eee, 502C6B, e2bcea, TTxBG10, 2019SPEDM, BGss506, bgssaff9, AFfbG10, BGBFAFF2019, BGCITYADS2019, BGVDay10%off
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Xiberia S21 Gaming Headphones. The lowest price was: $43.77.
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)).