BOXLTD Headsets H+ Bluetooth 4.1 Wireless Bass Stereo Over-Ear Headsets Bulit-in Microphone FM Radio SD Card White Unexpected 57mm ultra-large dynamic drivers, turbine style housing, with iconic 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+ 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 blockbusters Comfortable to wear: Its ear cup and headband top are padded with sufficient foam and covered with soft leather. What you may not notice is that we adjust the headband, based on Ergonomics theory, to fit all head sizes. Bluetooth 4.1 Chip: It's the latest Bluetooth chip, which can transmit data at high speed and bring you smooth music experience. Ultra low power consumption brought about 40 hours to 45 hours, call, 1625 hours standby (about 67 days), is 3 times the average of the Bluetooth Headset.