1. Advanced Bluetooth-Compatible 5.4 Technology: The USB BT 5.4 Dongle Adapter supports dual-mode, dual-channel connectivity and is compatible with Bluetooth-Compatible 2.0, 3.0, 4.0, 5.0, 5.1, and 5.3 standards. It features a smart low-power chip and RF transceiver for flexible, low-latency Bluetooth-Compatible applications. 2. Extended Range and Multi-Device Support: This Music Audio Receiver Transmitter offers a range of up to 20 meters in open environments and can connect up to 7 devices simultaneously, making it perfect for managing multiple Bluetooth-Compatible gadgets. 3. Versatile USB Compatibility: The USB Wireless Adapter supports both USB 2.0 and 3.0 interfaces, ensuring seamless integration with a wide range of devices, enhancing your audio and data transmission experience. 4. Plug and Play Convenience: The Music Audio Receiver is compatible with 8.1, 10, and 11 without the need for drivers, offering a true plug-and-play experience. 7 users can install drivers for full functionality. 5. Comprehensive Protocol Support: The USB Transmitter supports multiple protocols, including HFP/ for hands-free calls, A2DP/AVRCP for stereo music, HID/HOGP for keyboards and mice, and AAC for high-quality audio, ensuring versatile use for Android smartphones and more. Bluetooth version: Bluetooth-Compatible 5.4 (BLE low power consumption, low latency) Transmission distance: 20 meters (in an obstacle-free environment) Supported protocols: A2DP//AVRCP/HID/AAC, etc. Operating temperature: -20 to 70℃ Colour:Black Material:Plastic + Metal Package Contents: 1 x USB Bluetooth Adapter Only the above package content, other products are not included. Note: Light reflection 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.