Bluedio HT Black Safari Starting New Smart Version 4.1 Bluetooth Wireless Stereo Music Headphone Earphone Sport headset .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 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. 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). ust 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), to communicate with you in your language.