Fangrui Product Details 1. Usb Bluetooth 5.4 Adapter Transmitter Receiver Bluetooth Audio Pc Adapter 2. Bluetooth Version: V5.4 3. Frequency Range: 2.4ghz (2402-2480mhz) 4. Support Protocol: A2dp, Hsp, Avrcp, Hid, Etc. 5. Transmission Distance: 20m (open And Unobstructed Distance) 6. Rated Voltage: Dc 5v 7. Interface Type: Usb 8. Operating System: Windows 8.11011 System 9. Dimensions: About 23.8 X 15 X 7.2mm 10. Note: Only The Adapter, Does Not Include Other Items In The Picture 11. Features: 12. Bluetooth 5.4 Chipset, Faster Transmission Speed, More Device Connections, More Stable Transmission Conditions 13. Compatible With Multiple Bluetooth Versions, Automatically Backward Compatible With Bluetooth Devices 5.35.25.15.0 And Below 14. Wide Range Of Compatibility, Support Multiple Devices Connected To Bluetooth At The Same Time 15. Pc Connected Keyboardmouse, Wireless Operation 16. Pc Connect Audio, Wireless Listening, Support Multi-device Connection, No Delay, Mobile Bluetooth, Stereo Hd Sound 17. Pc Connected Bluetooth Headset, Enjoy The Freedom Of Wireless Music 18. Built-in Wireless Signal Enhancement, To Achieve 20 Meters Barrier-free Long-distance Transmission, Stable And Smooth Connection, Refused To Intermittentdisconnected Connection