2hours(Charging Case), Standby Time About 300hours, bluetooth V5.0, Charging Time 1.5hours(Earbuds), Working Time 2hours, Waterproof IPX5, Sensitivity 96±3dB, Battery Earphone: 30mAh, Color Black, Call Time About 2hours, Model AA-UM4X, Transmission Range ≦10m, Charging Case: 320mAh.
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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. Only one coupon available!
Link: Banggood product page
1. ($14.99): BG5ce938
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGUM4X, BGAAO2, BGUM4XES, BGAAUM4X, BGHU0211, BG4BW25, BGLOAC1, 13f142, BGc87d28, BGa0b145, BGE4BC18, BGBuscape01, BGUM4X1, BGHOTSHOP15, BG53e9c8, BG72ba1f, BGAlerabatKL, BGe4b182, BG1567a2
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – BlitzWolf AIRAUX AA-UM4X Bluetooth V5.0 Earbuds [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for BlitzWolf AIRAUX AA-UM4X Bluetooth V5.0 Earbuds. The lowest price was: $14.99.
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)).