XIAOMI | Redmi Buds 4 White | BHR5846GLDimensions 6. 5 x 4. 8 x 2. 6 cm Batteries 1 Lithium Polymer batteries required. Up to 35dB hybrid active noise cancellation Effectively isolate excess outside noise: With 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. 3