High-Fidelity Audio: UGREEN USB Bluetooth Adapter is equipped with the latest Bluetooth 5.4 technology, optimizing the transmission delay and connection defect problems of the old Bluetooth 5.0. Our Bluetooth 5.4 adapter will bring you a faster, more stable, and smarter connection with less sound quality loss. Up to 5 Devices Sync Connected: UGREEN Bluetooth dongle for PC supports up to 5 devices to be connected at the same time without interfering with each other, Which means that you can listen to high-quality music while using the keyboard or other devices. Plug & Play or Free Driver Plug and play for Win11/10/8.1(The latest Bluetooth 5.4 will be shown if you download the driver). Also supports Win7 (driver required for Win7). The driver could be downloaded by contacting customer service via Message. What Can I do if the Bluetooth adapter can not work?: Ensure there are no other Bluetooth devices installed on the computer. If there are, disable all existing Blue