? 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. ?Lifetime Warranty?: We can offer lifetime manufacturer replacement warranty and 90 days no questions asked return policy.( If have any question, please contact us via message ). ?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/support/driver-download/bluetooth/b3536/ ; WARM TIPS: please disable the built-in bluetooth driver before plug this usb device to your computer ). ?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.). ?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.). ?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.