Main Features: Highly Flexible Headband: Made of high toughness PC material with soft PU leather cover, the headband is foldable and flexible. Soft Earpads: On ear design with soft memory sponge fillings ensure long time wearing comfort. Ultra-long Standby: Up to 1100 hours long standby, can listen music or talk for 25 hours continuously. Hi-Fi 24bit HD Sound Decoding chip: Built-in 24bit HD chip, brings you real Hi-Fi surround sound. Bluetooth 4.1 chip: Adopts latest Bluetooth chip, transmitting data at high speed and bring you smooth music experience. And its low power ensures long lasting battery life, which can be up to 5 hour continuous music time. Also it works well with most smartphones for iPhone / HTC / Motorola / LG / Samsung Simple and stylish: The design is quite simple and stylish. 2 colors for your choice: Black and white for your choice. The white one have colorful geometric figures and black one have white random letter for decoration. Show your own style. Clear calls: Adopts acoustic echo cancellation for calls, a technology which can help to cancel echo and bring you clear calls. Also, you will never miss a call when you're enjoying music. Support Line-in Music: Play music from MP3 player, smartphone or other audio devices via double-head 3.5mm aux-in cable.