Secure fit and all day comfort The ergonomic fit and open ear design ensures they stay secure in place and all day comfort during various activities without causing pressure or pain on the ears. Noise canceling dual microphone, clear phone call These wireless bone conduction earphones built-in dual noise cancelling microphone, which can effectively reduce the interference of the surrounding ambient sound on the music or call, thus making the call or music clearer and louder. Advanced QCC3024 Bluetooth chip, Stable and fast Bluetooth connectivity, Better sound quality Thess wireless bone conduction headsets Use advanced QCC3024 Bluetooth chips, which will bring stable wireless connectivity, improved sound quality, noise-canceling features, enhanced battery life and device compatibility. IP67 waterproof are designed to withstand sweat ,rain and water, making them suitable for intensive workouts and outdoor activities. Reminder: this bone conduction headphone doesn't built in MP3 player and storage card, it is not able to switch MP3 mode, so it is not suitable for swimming. Large battery and fast charging Built in 200mAh rechargable battery, every single charging takes 2 hours support about 6-8 hours playtime, which last a long listening sessions without needing frequent recharging.This bone conduction headset also supports fast charging, 10mins fast charging can support 40mins music play. Support multi-devices connection The wireless bone conduction earphones built in microphone, compatible with iPhone/Android cellphone,can connect with two different devices simultaneously.You can seamless switch it between the two devices at will, without repeated pairing, simplifying your audio experience. You can easily switch between devices without having to disconnect and reconnect each time. Once connected, you don’t need to go through the pairing process every time you switch devices. Quickly switch between work and personal devices, improving workflow and reducing downtime. Easily control the musics and calls The multi-function button on left side is designed for easy control of volume, track selection, and playback. You can manage your music and control the calls by easy clicks. You also can adjust the volume on this wireless headset without taking out your cellphone.