Fangrui Product Details Intelligent Low-power Chip, Rf Transceiver, Providing Lower Delay, Flexible And Powerful Bluetooth Application. Support Cass2 Power Level 20 Meters Distance (in Open Environment) Support Bluetooth 5.4 Dual-mode Specification (lmp 13.x True Bluetooth 5.4 Standard) Support Usb2.0/3.0 Interface. Support Multiple Devices To Connect At The Same Time (up To 7 Devices Can Be Connected) Working Temperature -20 To 70operating System Support: Windows 8.1, 10, 11 (driver-free, Plug And Play) Windows7 Installation Drivers Can Be Used. Support Protocols: Hfp/hsp (hands-free Phone/headset) A2dp/ Avrcp (stereo Music) Hid/hogp (keyboard And Mouse) /acc. Android Smart Phone, Etc. Note: Win8.1/10/11 Driver-free, Plug And Play, Win 7 Need To Install Drivers. This Product Is Not Supported On For-macos/ios System. Blutooth 5.4 Adapter 5.4 Bluetooth, Dual-mode And Dual-channel, Compatible With Bluetooth 2.0, 3.0, 4.0, 5.0, 5.1 And 5.3 Specifications. Colour:black Material:abs+metal Package Contents: 1 X Bluetooth 5.4 Adap