Built-in immersion sound and noise cancellation up to 43 dB. The three ANC modes deep, balanced, lightweight and the adaptive mode allow a quiet environment around you. you can connect them to two devices at the same time. with a single charge, you can enjoy up to 9 hours of music with active ANC, and up to 36 hours with the charging case. The Xiaomi Earbuds app. you can find interesting functions such as selecting the ANC mode or the headphones if you have lost them. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.