1. Bluetooth MP3 function supports stereo music playing, phone calling 2. Support all audio devices that have Bluetooth capability, such as, mobile phone, tablet, laptop, computer 3. With SD card inserted, without any Bluetooth device, still enjoy music anytime anywhere 4. Headphones support FM radio 5. 3.5mm audio jack, provides simple wired connection of a variety of devices without Bluetooth 6. Allow you to answer or reject phone calls anytime, anywhere 7. Charged via USB, rechargeable battery, convenient and practical 8. Good quality, adjustable length hinge design, very comfortable to wear and easy to carry 9. Best choice for listening to music, watching movies, chatting online, and so on