AECO New Version HT(shooting Brake) Wireless Bluetooth 4.1 Stereo Headphones GENUINE AECO PRODUCTS ,Don't buy fakes from unauthorized sellers. Iconic powerful bass resonance of AECO: Unexpected 57mm ultra-large dynamic drivers, turbine style housing, with iconic AECO surging low-frequency shock, let you feel the bass resonate deep in the chest, enjoying the best sound quality. Clear and transparent bass, mids and highs, fully exposed to all the details of song, you can hear what the artists really want you to hear, Coldplay or Linkin Park concerts are simply playing around your ear. Ultra-long operation and carefree calling from Bluetooth 4.1: With robust high speed CPU of Bluetooth 4.1 operating system, comes with ultra-long 40 hours music, 45 hours talk and 1625 hours (around 67 days) standby time, the same battery, decrease up to 40% power consumption compare to Bluetooth 4.0. Acoustic echo cancellation and 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. Customized function: Audio Sharing allows you to connect to another H(Shooting Brake) headphone via audio cable, share music feast with your friends instantly(*recommended to use headphones with impedance of 32 or higher). Seamless connect two Bluetooth devices simultaneously, listen to music or enjoy foreign blockbusters, do as you think about it. 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.