Reference: 3948 Xiaomi Redmi Buds 4 - a new generation of popular upper middle class headphones. Support for wireless charging, advanced ANC noise reduction up to 35 dB, quality sound delivery, 6 and 10 mm audio drivers, 3 microphones with noise reduction for clear calls, dust and water resistance IP54. Very high battery life of up to 6 hours of headphones and another 30 hours with the charging box. Connect up to two devices at the same time, Bluetooth V5.2, low-latency game mode, auto-stop playback when removed from the ear. Universal compatibility with Android, iOS and Windows.