Xiaomi Redmi Buds 4 WhiteWith hybrid active noise cancellation technology, the feed forward and feedback microphones work together to effectively separate background noise. Whether you're outdoors, on the bus or metro, one touch for up to 35dB\* noise cancellation. Redmi Buds 4 blocks out the hustle and bustle. Intelligent scene judgement based on ambient noise levels. Redmi Buds 4 intelligently switches between 3 ANC levels under adaptive mode supported by AI algorithm and