Main Features: 
<br />powerful bass resonance of Bluedio: 50mm ultra-large dynamic drivers, let you feel the bass resonate deep in the chest, enjoying the best sound quality. Clear and transparent bass, mids and treble, fully exposed to all the details of song, you can hear what the artists really want you to hear, Coldplay or Linkin Park concert played in your ear.
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<br />Ultra-long operation and carefree calling from Bluetooth 4.0: With robust high speed CPU of Bluetooth 4.0 operating system, comes with ultra-long using of 8 hours music, 5 hours talk and 20 days standby time, noise reduction effectively reduce ambient noise while talking, make far-end listener cannot hear what you said become history, just like talking face to face
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<br />Customized function: Audio Sharing allows you to connect to another H headphone via an audio cable, share music feast with your friends instantly (recommended to use headphones with impedance of 32 or higher) Simultaneously connect two Bluetooth devices, connects with your phone and tablet seamlessly, listen to music or enjoy foreign blockbusters, do as you think about it
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<br />Comfortable wearing: Custom fit supra-aural soft earmuffs, artificial protein leather of earmuffs simulated to human skin texture, ensure long lasting comfort in various rugged circumstances
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<br />Convenience: Just a plug with audio cable(not included), then listen to your favorite tracks without using any battery, no matter how long is your playlist.
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<br />Specification:
<br />Wearing type : Headband
<br />Function : Voice control, Answering phone, Song switching, Bluetooth, Multi connection function, Noise Cancelling, Microphone
<br />Connectivity : Wireless
<br />Connecting interface : USB
<br />Application : Mobile Phone
<br />Plug interface: Full-sized
<br />Driver unit: 50mm
<br />Frequency response : 20~20KHz
<br />Impedance : 32
<br />Sensitivity : 85 dB
<br />Power supply: USB port DC 5V
<br />Working time: Talk time: 5 hours; Music playing time: 8 hours
<br />Standby time: &amp;gt;20 days
<br />Charging time: About 2-3 hours
<br />Bluetooth: Yes
<br />Bluetooth version: V4.0
<br />Bluetooth distance: W/O obstacles 10m
<br />Bluetooth band: 2.4GHz
<br />Bluetooth protocol: HSP, HFP, A2DP, AVRCP
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<br />Package contents: 
<br />1 x headset
<br />1 x USB Cable
<br />1 x user manual