2.Ultra-long operation and carefree calling from 4.1: With robust high speed CPU of Bluetooth 4.1 operating system, comes with ultra-long using of 40 hours music, 45 hours talk and 1625 hours (approximately 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. 3.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 devices, connects with your phone and tablet seamlessly, listen to music or enjoy foreign blockbusters, do as you think about it. 1.Iconic powerful bass resonance of Bluedio:57mm ultra-large dynamic drivers, turbine style housing, with the iconic Bluedi