High-Fidelity Audio: UGREEN USB Bluetooth Adapter is equipped with the latest Bluetooth 5.4 technology, optimizing the transmission delay and connection problems of the old Bluetooth 5.0. Our Bluetooth 5.4 adapter will bring a faster, more stable, and smarter connection with minimal 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).