Bluetooth 5.1 Dongle: With the latest Bluetooth 5.1 + EDR, Transmission distance ( 328ft/100M. ), 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 328ft/100M. ( 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 is need install the Bluetooth driver for Windows 7 system ( NOTE: please download the driver in this site: szedup.com/bluetooth-adapters/EPB3536GS.html; WARM TIPS: please disa