Bluedio Bluedio HT Wireless Bluetooth Headset, Strong Bass Stereo Iconic powerful bass resonance of Bluefin: Unexpected 57mm ultra-large dynamic drivers, turbine style housing Customized function: Audio Sharing allows you to connect to another H+ headphone via audio cable Comfortable to wear: Its ear cup and headband top are padded with sufficient foam and covered with soft leather Bluetooth 4.1 Chip: It's the latest Bluetooth chip, which can transmit data at high speed and bring you smooth music experience Connectivity technology: Bluetooth 4.1