Bone conduction headphones shield the eardrum by sending sound through the bones. Version 5.1 of Bluetooth for more reliable and quick transmission. excellent HIFI sound, offering crystal-clear audio for calls and music. featuring a digital battery display that provides real-time battery status information for the headphones. has a slot for a TF card. Both Bluetooth and TF card reading are supported. integrated battery with a 180mAh capacity. 8–10 hours of playback time on a long-lasting battery. Because of its flexibility, the headphone frame can be bent without breaking. uses a MicroUSB port to charge.