For a reason they are the best-selling Bluetooth headphones on AliExpress: they are from Xiaomi, have a battery for almost 40 hours and do not cost even 20 euros XiaomiThe Bluetooth device typically retails for more than 40 euros. They have become one of the most popular and best-selling options in the personal audio market. They feature 10-millimeter dynamic diaphragms and five adjustable equalizer modes controlled through the Xiaomi Earbuds application. Battery and charging caseXiaomi Redmi Buds 6 Play XiaomiThe headphones deliver up to 7. A fast charge function through USB-C provides three hours of playback after 10 minutes connected to power.