1. Bluetooth 4.1 version, strong compatibility, it could build faster connection and transmit stable signal in high speed. 2. Support TF card and Aux-in, you could enjoy music by different way, it could compatible with computer, tablet and etc. 3. Built-in microphone, one button to answer or hang up the phone, free your hands and enjoy clear phone call. 4. 2.0 soundtrack, selected drive unit, it could produce more dynamic and melodious sound, put you personally into music. 5. Equiped with 4000mAh battery, it could support 4-5 hours music time at the largest volume, long lasting life. 6. With a buckle design, it's portable, you could carry it around easily, as a company while travelling, camping, etc.