Product Features: 1. Compact size, semi-circular ergonomic design. Note: The plug and notebook are integrated; you essentially don't need to unplug it. It's recommended to unplug it regularly to restore the elasticity of the USB interface contact spring to avoid poor contact. 2. Adopts the industry-recognized British CSR 4th generation 2.0 Bluetooth main chip, boasting superior performance, more stable operation, better compatibility, faster speeds, and more convenient use. Reminder: This software must be installed to enable audio functionality. This product is equipped with stable performance and legally authorized "Genuine IVT V2.6.0.8" software, supporting Vista, Bluetooth stereo; supports MAC Apple, and supports Windcomm driver. Only one of these two operating modes can be selected. If IVT software is installed on your computer, the system will first operate in the standard IVT software mode, and the "completely driver-free" [plug and play] mode will fail. 4. Bluetooth transmission: Class 2 output, transmission distance is approximately 5-6 meters. 5. Bluetooth speed: The theoretical speed is 3Mbps, and the actual transmission is 200-240k/s when connected to a Nokia N73 Bluetooth 2.0 mobile phone. 6. Supports up to 7 Bluetooth devices simultaneously and supports Bluetooth service sharing (e.g., connect a Bluetooth mouse, connect a Bluetooth headset, or a Bluetooth mobile phone). 7. Bluetooth functionality: Suitable for all computers regardless of model, compatible with all Bluetooth mobile phones, Bluetooth headsets, and Bluetooth-related equipment.