Bluedio A (Air) Wireless Bluetooth 4.1 Stereo HiFi Headphone 3D Surround Sound With Mic HD Diaphragm HeadbandFeatures: 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 \/ SamsungSimple 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.Specification:           Model       Bluedio A (Air)           Wearing type       Headband           Function       Bluetooth、Microphone、Voice control、Answering Phone、Song Switching、Noise Cancelling、HiFi           Headset type       Dynamic           Connecting interface       Micro USB           Bluetooth version       V4.1           Profiles       A2DP、AVRCP、HSP、HFP           Impedance       16Ω           Transducers       57mm *2           SPL       118dB           Application       Mobile phone、Computer、Portable Media Player           Frequency response       15Hz~25KHz           Impedance       32ohms           Sensitivity       110dB           Talk time       25 hours           Music Time       25 hours           Standby time       1100 hours           Bluetooth distance       W\/O obstacles 10m           Bluetooth band       2.4GHz - 2.48GHz   Package Included: 1 x Bluedio A (Air) Bluetooth Headphone1 x Audio Cable1 x USB Charging Cable1 x Engslish User Manual