①. Item Type: BT Headphone ②. Material: ABS ③. Battery Type: Lithium Battery ④. Package List: 1 x BT Headphone ⑤. Stable Connection: Wireless headset uses Bluetooth 5.1 chip, supporting sound and video synchronization, with strong signal and relatively fast and stable transmission speed. ⑥. Heavy Bass: Bluetooth headset is equipped with a 40mm large dynamic unit, making music more textured and layered, delivering a strong bass effect. ⑦. Foldable: This Bluetooth headphone features an accuracy damping shaft design, which is foldable, greatly saving storage space and facilitating portability and use. ⑧. Noise Cancellation: Wireless headphone adopts passive physical noise cancellation and is equipped with a high sensitivity microphone to provide a clear calling experience. ⑨. Wide Compatibility: The over-ear headset is compatible with most Android and iOS devices, such as cell phones, tablets, laptops, etc.