Item Type: BT Headphone Material: ABS Battery Type: Lithium Battery Package List 1 x BT Headphone 1Stable Connection: Wireless headset using Bluetooth 5.1 chip, sound and video synchronization, strong signal, faster and more stable transmission speed. 2Heavy Bass: Bluetooth headset with 40mm large dynamic unit, music more texture, level more rich, bring a strong shock heavy bass effect. 3Foldable: This Bluetooth headphone with accuracy damping shaft design, foldable, greatly saving storage space, easy to carry out and use. 4Noise Cancellation: Wireless headphone with passive physical noise cancellation, with high sensitivity microphone to bring high definition calling experience. 5Wide Compatibility: The over ear headset is compatible with most for Android and for iOS devices, such as cell phones, tablets, laptops, etc.