Features: High-definition calling with 4 upgraded microphones Each earbud has 2 microphones in each (4 microphones in total) that combine to reduce background noise and enhance audio pickup for good clarity for calls or conference calls. Superior Sound Quality The 6mm dynamic and noise-isolating headphones deliver crystal clear in-ear calling quality. Seamless main dual earbuds The newly developed Bluetooth 5.0 chip transmits sound left and right simultaneously, no more relaying sound from one ear to another. Switch between stereo and mono mode without stopping. 24 hours of playtime The earbuds provide 5.5 hours of playtime, with the charging case you can enjoy an additional 24 hours. Unlock to pair The earbuds will automatically turn on and off when you open the charging case IPX5 Waterproof Give your headphones all kinds of protection from sweat and stains. Fast charging technology via USB Type-C and Quick Charge USB-C allow you to eliminate the hassle of searching for charging cables of different specifications. The transfer speed is up to 10Gbps and it is fully charged in 90 minutes.