Using RTL8761B chip, in line with Bluetooth 5.1 technical specifications, dual-mode low-power transmission. Further transmission distance: 10-20m ultra-long transmission distance (no barrier), strong signal.Stable transmission rate: 3Mbps transmission rate, providing high-speed file and audio data transmission. BLE ultra-low latency ultra-fast link, intelligent sleep wake-up and energy saving, 24-bit check to resist interference, adaptive frequency hopping to reduce crosstalk.Completely backward compatible with Bluetooth 2.0, Bluetooth 2.1 and Bluetooth 3.0 specifications. USB2.0 interface is more general, ultra-mini size is portable.5.1 Bluetooth adapter is the current new version, with strong compatibility, high speed and stability, and longer receiving distance, in line with Bluetooth 2.1 + EDR, Bluetooth 3.0 + and Bluetooth 5.0 LE regulations (with blue light indication).Applicable operating system: Support Windows7/Win8/Win10/11 mainstream operating system Specification:1. Dual-mode support Bluetooth 5.1High power (Backward compatible 2.0/3.0/4.0/5.0)2. Full-speed USB 2.0 interface3. Bluetooth v5.1 specification compliant4. 2.402-2.48GHZ ISM Band5. BLE Low power Consumption6. Class II power standard, distance of 10-20 meters.7. Support Bluetooth EDR data rate to 3Mbps8. LED Indication: Power on,Linking,Standby,9. System Support:Windows7,Win8,Win8.1,Win10/11.10. Software Support : Realtek Driver11. Chipset:RTL8761B12. Support Profile: Serial Port,Object Push,File Transfer,LAN Access,Personal Area Network,Audio Geteway,Heatset HID,Keyboard,Mouse,HCRP(Printer Cable Replacement),Bluetooth Low Energy,PIM Synchronization Profile, A2DP,AVRCPMaterial: Plastic + Metalcolour: blackPackage Contents:1 x Bluetooth Adapter1 x iver installation CDOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.