2. Support hands-free call function. 3. Support Bluetooth play: Listen to MP3 music from smartphones, tablets. 4. Support AUX audio line in. 5. Stereo music, presenting you high quality music. 6. Operate and convenient to carry. 7. Pressure-relieving and soft ear pad for comfortable wearing, even in long-time. 8. Power by a rechargeable 200mAh battery.