[Bluetooth 5.0 Technology]: The behind head bluetooth headphones is designed with advanced bluetooth chipset, ensuring faster transmission and stable signal connection, it can compatible with all kinds of bluetooth enabled device, such as cell phone, tablet and etc. The bluetooth connection range is about 33ft, gives you handsfree phone call and music experience. [Hifi-Stereo Sound] The headphones can deliver premium crystal stereo sound and it fliters out background noise, allow you to enjoy high quality sound performance with super bass even you are in a noisy environment. [Extremely Lightweight Sweatproof ]: The headphones earbuds can fit your ear with the maximum comfort, very secure and will never falling out to your ears, sweatproof design also allows you to use it when you are doing sports exercise. Only weight about 37 gram, slim small ultra lightweight deign makes it very easy to carry. [Long Lasting Battery Life]: With powerful Built-in rechargeable battery, it can support up to more than 11 hours music time, 14 hours talking time, 200 hours standby time with a single charge, great for all day outdoor sports exercise and indoor entertainment. [Multifunctional and Easy to Use]: The wrap around head bluetooth headphones has 5 control buttons, you can use it to adjust the volume up an down, adjust the previous/next music song, switch between bluetooth TF card, answer/hang up or reject call, play/pause music, and you can also use it to activate siri/google assistant. The headphones can support SD Card Play, you can put the sd card in MP3 bluetooth music player mode on the headphone to listen music. SKU - INSTOCK