Fangrui Product Details 5.4 Bluetooth Dual Mode Dual Channel, Compatible With Bluetooth 2.0, 3.0, 4.0, 5.0, 5.1 And 5.3 Specifications. Intelligent Low-power Chips And Radio Frequency Transceivers Provide Flexible And Powerful Bluetooth Applications With Lower Latency Support Cass2 Power Level 20 Meters Distance (in Open Environment) Supported Operating Systems: 8.1, 10, 11 (driver-free, Plug And Play) 7 Can Be Installed With Drivers. Supported Protocols: Hfp/ (hands-free Phone/headphone) A2dp/ Avrcp (stereo Music) Hid/hogp (keyboard And Mouse)/acc. Android Smartphones, Etc. Bluetooth Version: 5.4 (ble Low Power Consumption, Low Latency) Transmission Distance: 20 Meters (barrier-free Environment) Support Protocols: A2dp, , Avrcp, Hid, Acc, Etc. Support Usb2.0/3.0 Interface Supports Simultaneous Connection Of Multiple Devices (up To 7 Devices Can Be Connected) Working Temperature -20 To 70colour:blue+black Material:abs Package Contents: 1x Usb Bluetooth Adapter Only The Above Package Content, Other Products Are Not Included