Product performance characteristics: 1. Small appearance, semi-circular ergonomic design Note: The plug-in and the notebook are integrated, basically there is no need to pull it out. It is recommended to unplug it regularly to restore the elasticity of the contact spring in the USB interface to avoid poor contact. 2. Adopt the bluetooth main chip of 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 use. 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, supports Vista, supports Bluetooth stereo; supports MAC Apple, supports Windcomm driver. Only one of these two working modes can be selected. If IVT software is installed in your computer, the system will work in the default IVT software mode first, and the "full driver-free" [plug and play] mode will fail. 4. Bluetooth transmission: Class 2 output, the transmission distance is about 5--6 meters; 5. Bluetooth speed: The theoretical speed is 3Mbps, and the actual transmission is 200-240k/s when connected with Nokia N73 Bluetooth 2.0 mobile phone; 6. Support devices, support 7 bluetooth devices at the same time, and support bluetooth service sharing (for example: connect a bluetooth mouse, connect a bluetooth headset or a bluetooth mobile phone); Seven, bluetooth functions: suitable for any computer regardless of model, compatible with all bluetooth mobile phones, bluetooth headsets and bluetooth related equipment