Features: 1.Bluetooth 2.1 for all of your the devices with built-in Bluetooth function. 2.Hands-free function: When it's in Bluetooth mode click the phone button once to answer incoming calls. 3.You can insert TF card to play music plug and play. Currently it supports MP3 format audio file playback. 4.Supports TF card mode data transfer up to 64GB card reader function. 5.2-in-1 function cable: The equipped USB cable can be used for battery recharge and data transfer. 6. With built-in rechargeable battery 7. Support a key to answer function 8. Produce high-fidelity sound effect 9. Quick frequency response range 10. Adopts advanced electronic components 11. Designed with silk tweeter system 12. Give you extraordinary audio experience