Bluedio HT Turbine Wireless Bluetooth 4.1 Stereo Headphones with Mic (Black) Iconic powerful bass resonance of Bluedio: Unexpected 57mm ultra-large dynamic drivers, turbine style housing, with iconic Bluedio surging low-frequency shock, let you feel the bass resonate deep in the chest, enjoying the best sound quality. Ultra-long operation and carefree calling from Bluetooth 4.1: 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 compared to Bluetooth 4.0. 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) 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 Convenience: Just a plug with audio cable(buy separately), then listen to your favorite tracks without using any battery, no matter how long is your playlist. H-turbine also incorporate 4 languages voice prompt(Chinese, English, French, Spanish)