Key Features . Smart noise cancellationUp to 6 hours playback on a single charge22 more hours of charge stored in the case35dB active noise cancellationDual transparency mode allows you to converse freely while wearing the earbudsIPX4 Water Resistant . Flagship hybrid active noise cancellation35dB deep noise cancellation Allowing you to enjoy a world with less background noise The earbuds adopt the dual active noise cancellation technology with feedback and feed-forward microphones. They effectively cancel ambient noise and reduce excess noise in the ear canal. Noise cancellation can be as deep as 35dB Recover more sound details9 mm composite vibrating diaphragm coil brings you excellent hearing experience. After being tuned by a professional from the Xiaomi’s internal sound lab a high-pitched sound is clear and not distorted while a low-pitched sound is rich and pure with more refined sound quality. Continue to enjoy the musicWith a built-in low-power chip the earbuds can operate up to 6 hours for a single charge. With the assistance of a charging case the earbuds can operate up to 28 hours. Thus you can enjoy music for hours on end. Supports fast and wireless chargingWith fast charging the earphones can charge for just 10 minutes and then allow you to listen to music for up to 3 hours. If the battery is running low take a short break and let it power up. The charging case also supports Qi wireless charging making charging super convenient..