Bluetooth 5.1 Dongle : With the latest Bluetooth 5.1 + EDR, Transmission distance ( 656ft/200M. ), faster data rate ( 3Mbps), and lower power consumption; Backward compatible with Bluetooth 5.0/4.2/4.1/4.0/2.1/2.0 Dual-mode Bluetooth transfer, compatible Full-speed USB 2.0/USB 1.1 interface. Bluetooth 5.1 Adapter for PC: Help your old desktop add wireless Bluetooth function to connect more Bluetooth devices such as: mouse, keyboard, headphones, headset,speaker, printer, etc. ( Not compatible with Mac, car stereo or TVs.) Long Range Wireless Transfer: This USB Bluetooth dongle with 2dBi external antenna, long range wireless transfer can up to 656ft/200M. ( Note: Operation range can be affected by physical obstructions and wireless interference.) Support OS: Plug and Play for Windows 11/10/8.1/8; It needs to install the Bluetooth driver for Windows 7 system ( NOTE: please download the driver in this site: szedup.com/support/driver-download/bluetooth/b3536/ ; WARM TIPS: Please disable the built-in bluetooth driver before plug this usb device to your computer ) Work with Multi-Device: This usb Bluetooth dongle can make your computer for working with many devices at the same time.The anti-interference ability has been increased, new technologies have been adopted to reduce the loss of transmission efficiency caused by interference in the 2.4 GHz band.