Features: [Headphones and Speaker Mode] Twist the headphones inwards to active headphone mode and immerse in your own music world; twist the earcups outwards to active the speaker mode and share music with others. [Wireless Connection] Easy to pair with almost all BT-enabled audio devices to enjoy wireless stereo music. NFC feature enables simple pairing with NFC-enabled devices by a single touch. [Various Music Playing Modes] With 3.5mm audio jack, it can connect to many music players (such as, MP3 / MP4, etc) without BT function. It also supports TF card music playing and FM radio function. [Hands-free Calling] Built-in high-sensitive microphone reduces ambient noise and grasp the detail of voice, offering high quality hands-free phone conversation and setting your hands free. [Ergonomic Design] Soft PU leather cushion head-pad and ear-pad ensure long time wearing comfort. Adjustable headband is suitable for different head size. Foldable design, easy for storage.