Product Features: 1. Compact size, half-round ergonomic design. Note: The plug-in module and laptop are integrated, so there's essentially no need to unplug it. Regular unplugging is recommended to restore elasticity to the USB interface contact spring and avoid poor connection. 2. Employs the industry-recognized British CSR 4th generation 2.0 Bluetooth chip for superior performance, stability, compatibility, speed, and ease of use. Reminder: Software installation is required for audio functionality. This product features stable performance and legally authorized "Genuine IVT V2.6.0.8" software, supporting Vista, Bluetooth stereo; supports MAC Apple, and 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 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: Theoretical speed is 3 Mbps; 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, Bluetooth headset, or 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.