Key Features. Smart noise cancellation Up to 6 hours playback on a single charge 22 more hours of charge stored in the case 35d B active noise cancellation Dual transparency mode means that you can converse freely while wearing the earbuds IPX4 Water Resistant. Flagship hybrid active noise cancellation 35d B deep noise cancellation Allowing you to enjoy a world with less background noise The earbuds adopt the dual active noise cancellation technology with feedback & feed-forward microphones. They effectively cancel ambient noise & reduce excess noise in the ear canal. Noise cancellation can be as deep as 35d B Recover more sound details 9 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 & not distorted while a low-pitched sound is rich & pure with more refined sound quality. Continue to enjoy the music With 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 & wireless charging With fast charging the earphones can charge for just 10 minutes & then allow you to listen to music for up to 3 hours. If the battery is running low take a short break & let it power up. The charging case also supports Qi wireless charging making charging super convenient..