Deep Bass Sound and Clear Call：Headphones have a built-in 8mm loudspeaker, which makes the high notes dynamic and the bass powerful, so you can enjoy the music. Built-in mics and noise-cancelling technology allow you to enjoy clear calls | 1-Second Control by Shortcut Keys：There are shortcuts on both earbuds,press shortcut key one time to turn on and off the music.Press the left ear twice to cut to the next song, twice the right ear to the previous song | 60H Battery Life：Redpepper headphones built-in 400mah large battery, which can let you one time enjoy 10H music, talk, playing time,with charging case use time is up to 60 hours | 5.3 Bluetooth Connection：Using 5.3 Bluetooth, shorten the time of Bluetooth connection, open the cover for 1-second to connect smart devices.and enhance the strength of Bluetooth , connection distance up to 10 meters | Soybean Weight Headphones：Using the new ultra-light material, the earbuds weigh as much as a bean, and the mini charging compartment is designed to be carried around without burden, allowing you to enjoy music in the gym, library, and outdoors