Xiaomi Redmi Buds 4 Pro Wireless Earbuds Hi Resolution Audio with Dual Driver Speaker Immersive Sound Up to 43dB ANC Dual Device Connectivity 36h Long Battery with Fast Charging Redmi Buds 4 Pro is certified by Hi-Res Audio Wireless and supports LDAC audio codec at transmission speeds of up to 990kbps, as well as audio resolutions of 96kHz/24bit and above. Features an all-new dual dynamic driver system, which consists of a 10mm aluminum alloy diaphragm and a 6mm titanium diaphragm for treble frequencies. Together, the two drivers combine to deliver crystal-clear treble and rich bass in a wide range of genres. An all-new immersive sound system, which uses a Xiaomi proprietary HRTF sound algorithm to simulate real-life sound and a deliver a truly immersive experience when watching video, compatible with various audio source and playback devices. The earbuds can reduce noise by up to 43dB, blocking up to 99.3% of external noise*, allowing you to enjoy your music in peace and quiet.