Come and Check Our Promo Solutions.Bluetooth version 5.0 is adopted.It is fast and has a data active error correction mechanism at the receiviong end,which reduces the occurrence probability of the card and enhances the user experience.The bone conduction headset and Bluetooth headset can be switched by double clicking, mainly for hearing aid, suitable for the elderly with mild deafness Pls check inventory and detailed info with us before placing your orders.