Features: You must connect your phone with BT. The product with microphone, convenient to use. The string of headset is retractable, fit different people. With External Audio Line function, you can use it as ordinary earphone in computer and phone(without BT function). With Volume key and Pause key, convenient to use. Made of high quality material, durable. Support TF card, you can get different music.(16G Without TF Card) It is 90rotation, convenient to storage. It has high quality sound, enjoy your life.