Latest Bluetooth 5.4 Technology: This USB Bluetooth adapter features the newest Bluetooth 5.4 standard, offering dual-mode, dual-channel capabilities for faster data transmission, more stable connections, and backward compatibility with Bluetooth 2.0, 3.0, 4.0, 5.0, 5.1, and 5.3 devices Multi-Device Connectivity: Equipped with a smart low-power consumption chip, this adapter allows simultaneous connection of up to 7 devices. Connect headphones, speakers, keyboards, mice, and other Bluetooth-enabled devices seamlessly and without interference Long-Range Transmission: With Class2 Power Level support, this Bluetooth adapter provides a connection range of up to 20 meters (in open environments), offering flexibility and convenience in any workspace or home setup Broad Compatibility & Plug-and-Play: Designed to support Windows 8.1, 10, and 11 with plug-and-play functionality (no driver needed), and Windows 7 (driver installation needed). It supports a variety of protocols including HFP/HSP (hands-free/headset), A2DP/AVRCP (stereo music), and HID/HOGP (keyboard/mouse) Compact & Durable Design: Built for performance in any environment, this adapter can withstand a wide operating temperature range from -20℃ to 70℃. It connects via USB 2.0/3.0, ensuring fast data transfer while maintaining low power consumption Specifications: Model: BT542 Bluetooth version: Bluetooth 5.4 (BLE low power consumption, low latency) Transmission distance: 20 meters (in barrier-free environment) Supported protocols: A2DP, HSP, AVRCP, HID, ACC, etc.