bluetooth Version V5.0, Supported Protocal HSP/HFP/A2DP/AVRCP, Speaker Φ6mm, Emergency Powerbank Yes, Transmission Distance ≥ 33 feet (10m), Magnetic Absorption Yes, Earbud: 40mAh/3.7V/0.185WH, bluetooth Chip AB1526P, Noise-signal Ratio 95 dB, Receive Sensitivity -83dB/3M, Charging Box: 2600 mAh/3.7V.
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Aliexpress
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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 China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($37.79): 10%ForNewBW
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGBWFYE3S, BGFYE3S, BGFYE3S3C, BGss10%bw, BGFYE3S709, 12blitzw, BGFYE3SQ, 502C6B, BGFYE3SW, BGBWFYE333, BGFYE3S66, AFfbG10, d3ea27, BGVDay10%off, EARSP11, BGkonimbesinF3, BGFYE3SUKK, BGAFF10OFF, bGhOnEy10, BGBW152, BGFYE3SCZ, BGBWUU1, BGFYE3SQH, BGSS10%SW, bgshOOp10, BGELIG0920, BG11SHOP, BG4BW25, BGLOAC1
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – BlitzWolf BW-FYE3S Wireless Earphones [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for BlitzWolf BW-FYE3S Wireless Earphones. The lowest price was: $25.99.
Price records source(s): 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)).