About this item Outstanding Sound Quality:High-definition stereo headphones, specially developed software and noise reduction technology designed to keep you out of ambient noise and let you focus on what you want to hear. Adjustable:They are foldable,adjustable and stretchable, which allows you to find the perfect fit without constraint and excellent durability. Long Battery:Zihnic Bluetooth Headphones are Rechargeable. 450mAh battery, 14 hours of music time, 2.5 hours Fast Charing. Compatibility:Zihnic Bluetooth Headphones has last 5.1 Bluetooth technology and are compatible with all Phones X, 8 Plus, Samsung S9, S8, Pads, Pods, Huawei, Nexus, Amazon Alex Three Mode:Zihnic Bluetooth Headphones have three mode.The first one is Bluetooth mode,you can connect with any Bluetooth devices.Next is MP3 mode,you can insert the TF or SD card,the Zihnic Bluetooth Headphones can play the song in SD card.Last mode is FM mode,Zihnic Bluetooth Headphones can receive the radio channel in local.