Product Features: 1. Small appearance, ergonomic half-round design Note: The plug and notebook are integrated; in principle, you don't need to pull it out. It's recommended to disconnect it regularly to restore the elasticity of the contact spring in the USB interface to avoid poor contact. 2. Equipped with Bluetooth chip from the British CSR 4th generation 2.0 version, which is recognized in the industry and has better performance with more stable performance, better compatibility, faster speed, and more convenient usage. Reminder: This software must be installed to realize the audio function. This product is equipped with stable performance and legally authorized "Genuine IVT V2.6.0.8" software, supporting Vista, supporting Bluetooth stereo; supporting MAC Apple, supporting Windcomm driver. Only one of these two operation modes can be selected. If IVT software is installed on your computer, the system will first operate in the standard mode for IVT software, and the "fully driver-free" [plug and play] mode will fail. 4. Bluetooth transmission: Class 2 output, transmission distance is about 5-6 meters; 5. Bluetooth speed: Theoretical speed is 3Mbps, actual transmission is 200-240k/s when connected to Nokia N73 Bluetooth 2.0 mobile phone; 6. Support devices, support 7 Bluetooth devices simultaneously and support Bluetooth service sharing (for example: connect a Bluetooth mouse, connect a Bluetooth headset or a Bluetooth mobile phone); 7. Bluetooth functions: Suitable for all computers regardless of model, compatible with all Bluetooth mobile phones, Bluetooth headsets and Bluetooth-related accessories